And legs and shoulders on the same day

I struggle to walk let alone train anything after a thigh workout

Whatever people suggest on here, do not chop and change each week. The whole concept of getting stonger and thus bigger relies on steady gains on the basic exercises. Chopping routines around can upset this, e.g. if you normally train shoulders first and then the following week you train them after chest, you will no where near be as strong on the shoulders, so how do you gauge improvement?.

I recommend sticking to a routine for at least 6-8 weeks before changing. If you are in a plateau, look at the other aspects of your training before chopping routines around (diet and recuperation)

Paul.