Okay, I figure I could give my own view on how Goku may scale in 3-A with multiplier bs.
Okay so, if I recall correctly it was estimated that Base Goku is over 10x universal after he fought Beerus. This was prior to the debates of the DB verse's actual size which has been estimated to be over 100x that of the observable universe. If this is accepted then this feat should be over 100x greater. That is, Base Goku would have to be over 1,000x 3-A after fighting Beerus.
We can not estimate how much stronger Goku grew from Whis's training so we will ignore it for now.
SSB Goku is vastly superior to SS3 Goku which is vastly superior to SS (accepted as being 40-50x multiplier) so Goku would be many times the power of someone 40-50,000x 3-A.
Goku then trained with Vegeta for three years but we can't estimate how much he would have grown.
Hit was capable of evolving his time skip to handle SSBKKX10 Goku...who would have been many times someone 400-500,000x 3-A (10x the previous due to KKX10 which is then multiplied by SSB). By the time of their rematch Goku can achieve a similar result.
Due to Blue Goku matching Hit after the Black arc we can ascertain that Post-Black, Pre-ToP Goku would be 400-500,000x 3-A in Super Saiyan.
Goku then was depicted as, physically, powerful as Hit (if not moreso) in the Tournament of Power itself with just God. Blue is generally accepted to be 40-50x God so if this is, indeed, accepted then that means Goku would have to be 50x stronger in the ToP than he was before.
ToP Pre-UI SS (Treated as God) Goku = 16,000,000-25,000,000x 3-A
ToP Pre-UI SS x 40-50 (Treated as Blue) Goku = 640,000,000-1,250,000,000
It is accepted that UIO is at least 40x SSB. Post-UIO2 Goku is stronger than UIO1 Goku.
Post-UIO2 SS x 40-50 (Treated as Blue) Goku = 25,600,000,000-50,000,000,000x 3-A
Post-UIO2 SS x 40-50 x 20 (Treated as Blue X20) Goku = 512,000,000,000-1,000,000,000,000x 3-A
Anything beyond this point is purely theory.
This is all heavily low-balled...as we can not calculate how much stronger Goku grew with Whis in a year or Vegeta in three years. The Hit scaling however provides credulence to ToP Goku being 500x the power of Universe 6 vs 7 Goku. (Presuming Hit didn't grow stronger until he fought and adapted to Dyspo and Jiren).
The final verdict, based purely on accepted multipliers and basic scaling takes Goku as being at, bare minimum, 1 Trillion times 3-A with Super Saiyan multiplied by Super Saiyan multiplied by Kaio-Ken X20.
To find the TRUE multiplier of Goku you would have to calculate SSG which is unfortunately improbable. But based purely on accepted Super Saiyan, Kaio-Ken and UIO multipliers we can ascertain that Goku is, indeed, 1 trillion times 3-A with Super Saiyan stacked by Blue and Kaio-Ken multipliers.
I know this obviously won't be accepted as 'true' but this IS the only acceptable scaling that can even remotely be presented based on accepted multipliers, accepted calculations and scaling based on Goku vs Hit.