Trump threw all the legal mud he could find on the wall in 2020, but none of it stuck. Is there a theory he hasn’t already tried that could work in 2024?
Maybe. If one or more state legislatures decides to overturn the election result and certify a slate of Trump electors, the Supreme Court would probably take a serious interest in that issue. Based on the election case opinions written in 2020, you would have three justices finding against Trump, three arguing either that the Constitution gives unlimited power to regulate elections to state legislatures or that the issue is a nonjusticiable political question, and three on the fence. The winner would have to get two of the three fence-sitters. How that one turns out, I do not know.
This is another issue that should be addressed in any election reform legislation, although the argument would be made that any limitations placed on state legislatures by statutes are unconstitutional. The real hope, of course, is that no legislature would have the nerve to ignore the result of an election–but are you really confident about that?