I do understand that is you've exited a bad relationship with a man you can feel exhausted from all the emotional labour and feel that at least in prostitution there is a set amount of time were you 'service a man's needs/wants' and the time and payment delineate it nicely, in a way that feels less arduous, added with the fact you are not emotionally/romantically invested.
But how you get back in depends, as Librarylady says, on what you mean by easy entry? Its depends on what you want to get from escorting at this moment (it sounds obvious, well money, but how much/how often/how quickly) what your circumstances are, what you feel you might need to invest (in outfits, a place to work etc), would you prefer agency or indie, etc.