go to the below given link , it provides step by step procedure to go back to stock :-
https://forum.xda-developers.com/asus-zenfone-max-pro-m1/how-to/guide-revert-to-stock-rom-lock-t3798420
try resurrection remix if you want customizations , if you are going for stability the go for PA Quartz .
It's one of the best and all banking apps are working.