Trump was a corrupt unscrupulous businessman prior to getting into politics, as too in the time he spent as the President of the US and it didn't work.
Not to say he didn't have some valid ideas or important progressive agendas.
He actually did, his implantation was usually wrong due to his lack of experience and that of his chosen administration..
Quite simply put he didn't have the experience in politics of that level, which is the most powerful in the entire country
The January insurrection thing and being twice impeached put himself over the top as to not getting reelected again.
If those things didn't happen, he could have been a real contender for reelection .,,,,,, my guess.
Particularly for this recent past election.
Oh and consistently saying the last election was a fraud when there was overwhelming evidence it wasn't, showed he was inherently dishonest, that too put a black mark over himself as well.