Also, theres an infinite prestige glitch aswell

Legacy of rome gives you a decision to retake rome and get all titles in it, which will kick the pope out of Rome, if you are a catholic then you have the option to give rome back to the pope, which gives you a ton of piety, there is no limit to this so you can take and give back infinitely to break your piety score

how did you do this, i can barely break 10k

Catholic Legacy of Rome is broken as hell...