Nope, and he doesn't want to. He would not be a good president. What be would be good at is a cabinet position. Maybe even a legislator, though he'd have to figure out how to pick good staff for that job.
Well, he’s not a billionaire, unlike his predecessor. I generally view rich people in politics negatively as a rule.
That said: I do think Poroshenko did as well as he could, considering he was elected after Russia invaded the Donbas in response to Ukraine revolting and throwing his super Russia-friendly predecessor (who “won” the election with a lot of Russian help, hence the revolt) out.