If he does somehow get a 2nd term, I wouldn't expect it to be much more than a figurehead position, even more than this coming term will be. He never liked the job of President, only the trappings of power and the freedom from consequences the office granted him. Now that he's been reelected, and the GOP consolidated around himself and his family, there's really not a lot he has to personally worry about, besides playing king and enacting revenge.
It's gonna be a massive shit show. Trump is only part of it, we also have to suffer the Americans.
As bad as Trump is, they suck way more, way, way more.