FiveThirtyEight has a discussion on whether Trump is losing strength.
Although I'd like to see him run in 2024 because I think he'd be beatable (a poll today shows him being beaten by Biden by 10 points), I don't think Dems will be that lucky.
Why: he's not developing any platform of ideas, or particularly responding to change. What seems to get him going is his grievances over 2020 which is starting to get old. If it feels dated now, think what it will feel like in 2 more years.