This is why I run away from water damaged phones. The problem is that you fix one thing and then a new problem pops up. You can keep repeating the process over and over.
Its safe to assume the logic board has suffered severe damage. For sure on the charging system but it sounds like the touch system as well.
At some point you have to know when to stop. That's a decision that you make and only you. But your next step is going to involve replacing ICs if you do continue. And again...I promise that won't be the end of the repair.