I never rated him technically, he's not a central midfielder or a striker for a start, he's basically a 2nd striker who was good at finding pockets of space and finishing off chances
As an allround footballer you can understand if he doesn't run his **** into the ground how ineffective he would actually be, he was never that involved in games other than goal scoring
He was likely motivated by money and now he has it, has little left for paying football
Totally a mental issue of course, you don't get to that level of goalscoring and then just 'lose it' per se