I took the quest for the Evil Witch thing and have my sorcerer hero tackle the problem.
But there was this part where he had to meditate, but i can't click on him!!!

This was my first time encountering it, i edited him in CAS using deedawg's mod, i replaced his gambler flaw to drunkard but the gambler itch still won't go away

Edit : I tried doing resetsim on him but that does not do anything

Try changing his religion with debug options. should work.