Based on his history and the evidence that seems to be lined up against him apparently, he should be worried that he is going to prison.
Trump's worst mistake was running for the presidency and taking office. He thought it was his ticket to eternal adulation. The problem is that he is a substandard human being. He isn't very intelligent and he is crooked. That worked well enough for him as a celebrity real estate guy in New York, running scams and going to court against smaller companies. He believed his own hype and thought that he could enrich himself and run roughshod over the people and government of the United States.
It wasn't a completely stupid bet. The United States does not have an impressive track record of holding powerful people to account. The problem with Trump is that his appetites exceed his abilities. He is the proverbial bull in the china shop. He may have gotten away with emoluments but he tried to coerce another head of state to get dirt on a political opponent. He got impeached but that may not have stopped him from winning re-election but he completely and deliberately mishandled the response to a pandemic which killed over a million Americans from 2020 to 2022 because he didn't want to "seem weak" and tried to make it a PR issue rather than a public health emergency. When he lost the election because the response to COVID was so bad, he lied about the results and tried to incite an insurrection to keep himself in power. During that time he also stole documents, including some of our most sensitive national secrets and hid them in his golf club and bragged to others that he had top secret documents. He also tried to coerce and pressure multiple state officials and attacked and defamed election workers to try to subvert the election in 2020.
He tried to commit crimes WAY above his level of intelligence and competence, and like I said, the only reason he isn't already behind bars, is that as a nation, we have a PISS POOR record of holding people in powerful office to account. At this point, Trump is so incompetent that he has dug himself into a hole that he can only get out of by a massive effort to somehow win the 2024 election which he really should have NO HOPE of winning.