From the way that you write, I'm guessing that you're not even old enough to vote yet.
You're absolutely correct, Trump cannot become president in 2024. He could, however, win the election in 2024 and then become president in 2025.
Are you sure that you even know how the nomination process and then the general election works? You can vote for any Republican that you want during the Presidential Primaries and Caucuses because that's Republican vs Republican. When it comes time for the General election, however, I'll take Trump (or any other Republican) over Biden, Harris, Pelosi, Clinton, or any other brain dead corpse that they choose to put up.