It's also likely that if he had won the 2020 election, his second term wouldn't have been like this, since he wouldn't be so aggrieved. It would likely have been more like his first term, where he was basically a standard republican but with no decorum.
It took the democrats setting him up as an "easy to beat" opponent in 2016, getting beaten, flailing uselessly, torpedoing bernie for biden and beating him in 2020, assuming that he was vanquished for good, trying and failing to punish him for January 6th (thus setting him on the warpath), then enabling the Gaza genocide and completely fumbling the 2024 election, to put this specific version of Trump in power at the worst possible time. It's kind of like a feedback loop or a cascading failure. It's perfect in a way.