I've got
Bulma. There are tons of things I can do with this.
So, I'd meet Goku and pretty much start adventuring with him. I'd also secretly strike a bargain with Master Roshi to learn how to use ki without other people knowing. However, when the Dragon Balls are gathered, I'm wishing for something else.
"I wish to stop aging when I'm in my physical prime!"
From there, I'd go home, getting the help of my father, Mr. Briefs, to create a Gravity Room that can block ki signatures, so no one (including Dr. Gero) can get a gauge on how strong I actually am from consecutive gravity training. Later on, in fact, pretty early on, I'd try to climb Korin's Tower with a fairly low power level, but large enough so I could clear the tower fast enough before getting tired. From there, I'd try to get to Kami's Lookout. From there, I'd ask Kami to train me as a potential Guardian of Earth. I'd suggest training in the Pendulum Room, and then the Hyperbolic Time Chamber. The thing about the Pendulum Room is that it can allow an individual to train practically anywhere without affecting the flow of time. From there, I could learn things like Forced Spirit Fission, and possibly even Moro's magic. Of course, I'd also ask Kami and Mr. Popo to not let anyone know that I was training here.
I'd continue training alone in the Gravity Room once it's full developed, and growing in power, as well as constantly suppressing myself so no one knows that I'm getting stronger. I'd also talk to Tien to learn the Multi-Form technique, as that will help me later. Once I master the Multi-Form technique, I'll be able to use that to have a sparring partner in the Gravity Room, as well as two clones to spar and train in the Hyperbolic Time Chamber or with Kami and Mr. Popo. Since the Multi-Form technique divides your power level by the number of clones, that means that if I had a power level of 100, splitting myself into 4 would result in multi-forms having a power level of 25. However, if they all train and get 2x stronger, then they all have a power level of 50, which will result in my having a power level of 200. Honestly, with gravity training and training with Kami, the gains will probably get even higher. I'd pretty much just train in secret, hanging back to let the events play out like in canon. I'd also work on a Dragon Radar when I'm resting from training, as well as getting started on making a spaceship to get to Namek (since that's gonna happen). I'll have my own stashed with a higher setting for gravity training so I can get even higher gains when training.
During the 5 year timeskip from DB to DBZ, I'd make a few wishes. One each year, to be exact.
1. I wish to have Saiyan S-Cells in my DNA while retaining my appearance!
2. I wish to not need food to live!
3. I wish to not need water to live!
4. I wish to never get tired!
Assuming all of these are within Shenron's power, I could greatly continue to benefit from training and growing stronger. Now, I have the limitless potential of Saiyans. However, this also means I could do something else.
If it's possible, using the Multi-Form technique, I'd do the Super Saiyan God ritual. If it works, my power would exponentially increase, and I would continue training and growing stronger. Now, I won't need to worry about hiding my power level for the most part, just hiding the pressure of my god ki. Also, no need for food and water to survive means that I can train in the Hyperbolic Time Chamber for extended periods of time. However, I won't have to worry about getting very old, since I've already made a wish to stop aging once I reach my physical prime.
For the Saiyan Saga and Namek Saga, I'd be training. I'd also create little drones to collect DNA, much like what Dr. Gero did. I'll collect the DNA of Piccolo, some of the Earthlings, and Frieza when I'm on Namek.
From there, I'll be doing some experiments to find a way to implement all of those DNA samples into myself, almost like making myself into an Android like Cell or Android 21. I'll also be doing some training and of course managing Capsule Corp. I won't show off my full strength until later, after Cell shows up. I'd also try to have the Cell Saga play out per usual, making sure the Saiyans get access to Super Saiyan 2. However, I would grab some of Cell's DNA from after he upchucked 18.
In the Buu Saga, I'd also try to get a sample of Buu's DNA as well, either during or after the arc. I'd implement all of this and use it to make myself even more powerful, continuing to train using Vegeta as a partner and continuing to train when he needs to rest or sleep, etc. Using Frieza's DNA, I could survive in space, and train on neutron stars, much like how I mentioned in the Android 21 post I did. This would drastically increase my strength even more.
Now, onto Dragon Ball Super. Beerus wakes up and talks about the Super Saiyan God. Of course, it's my party, and I would be training intensively before the party to prepare for Beerus showing up, even having extra pudding there at the party so no problems occur.
Vegeta: "L-Lord Beerus!"
Beerus: "I'm here looking for the Super Saiyan God."
Bulma/Me: "Unfortunately, I'm not a Super Saiyan God. But, I'll try to entertain you. You all, get Goku and find out how to get the Super Saiyan God. I'll deal with him. Whis, was it? Could we take this elsewhere? Somewhere private?"
Whis: "Does that sound fine with you, Lord Beerus?"
Beerus: "Very well. We'll take this to an abandoned planet."
From there, I'd fight Beerus, explaining that I am a Super Saiyan God, and that I'm providing time for another Super Saiyan God to be created. Honestly, even with all my training, I still feel like I'd be at a massive disadvantage. Until...
Yup, a Majin form. I was setting up for that lol. Combined with my God ki, and after my training on Neutron Stars, Multi-Form usage, Vegeta as a sparring partner, limitless stamina, and techniques I've received from the DNA of the various fighters I possess, I'd likely end up being much more formidable against Beerus than Goku was. However, I don't know if I'd be strong enough to beat him or not. I'd probably definitely get a Zenkai from that fight. Before we return, I'd ask Beerus and Whis if I could be trained by them in secret, and if they'd make sure that no one knows about my strength and true level of power.
If they accept, I'll learn from them both, as I would likely accept the idea of being a God of Destruction candidate. So, I'd train with Beerus and learn how to use Hakaishin ki and train with Whis to improve with my martial arts and learn Ultra Instinct. I'd pretty much keep all of this to myself.
When the Tournament of Power rolls around, I'll probably finally unveil my power, replacing Tien in the Tournament of Power. I'd be able to absorb fodder, and even opponents like Cabba, Caulifla and Kale. This would increase my strength even more. I'd also wait until Toppo is off guard and absorb him as well. This would help us stand an even better chance at battling Jiren and winning the ToP.
As for the Moro Arc, I already have knowledge of Forced Spirit Fission, and will take away Moro's energy before absorbing him. So with that, I'd become even more powerful (the Broly Arc would play out like in canon, more than likely, minus that I might absorb him after Broly is wished back to Vampa).
From there, we'll have to wait and see what happens in the next arc. Though if I manage to learn all that Beerus has to offer relatively quickly, I'd probably absorb him in his sleep.
I'd be too strong as Bulma... She could lowkey be a massive supervillain if she actually put her mind to do something like that.