Past performance doesn’t guarantee future results. If Trump were to have a successful 2nd term, DeSantis would be in a good position to continue the existing policies. Biden/Harris have been a disaster so far.
Trump was on his way to getting reelected but COVID-19 happened. So there are not guarantees. We can't predict what happens in the future. If we could, we would had thought that Nixon would beat JFK in 1960. That's just one example right there.