Hear me out, with Social Influencing and the additional rule, I think John can solo
Homestuck
He drops into the verse during the events of the epilogues, specifically into the Meat epilogue, after John Egbert has left to go fight Lord English. This means he won't have to face the majority of problematic characters (Lord English, Ultimate Dirk, Andrew Hussie). He can then use his social influencing to befriend all the Homestuck kids and prevent them from killing him. Assuming he can talk to alternate timeline Feferi and MSPA reader (before they get Acausality 5), he can get them on his side too. With their help, along with the Homestuck kids, John should be able to beat God Tier Calliope, one of the only remaining problematic characters. From here, John can take his small army into the Candy epilogue timeline, where he can befriend the alternate Homestuck kids and John Egbert. Now, John (VSBW) can gradually persuade any character he can't beat into committing death or killing each other, with combination Social Influencing and Precognition.
I could be wrong tho, Idk
He would get 1-A stats,
Lord English's goofy Immortality Type 8 (or
MSPA Reader's Acausality Type 5, whichever is better) and resistance to Concept manip, and The Ultimate Weapon as equipment