There is almost always a "change" candidate and a "stay the course" candidate.
Change candidates examples: Obama 2008, Trump 2016, Clinton 92, JFK 60, Harding 1920, FDR 32, Reagan 80, McCain 2000, Carter 76
Stay the course: Hillary, Romney, McCain 08, Kerry, Biden 2020, Bush 41, Bush 43
Trump was a change candidate in 2016, as was Bernie.
Bernie still is a change candidate and Yang is a change candidate.
The rest are stay the course candidates. Warren is Hillary 2.0, Mayor Pete is the candidate of meritocracy.
Trump can argue that he is still trying to change the DC Establishment and the Impeachment and FBI malfeasance and media hatred only reinforce the point. Plus he will claim, rightly or wrongly, the overall better economy, and people will vote for economic improvement (like they did in 1996) over annoying personality.