If you vote for Republicans or Democrats, you're supporting the same duopoly that got us to this point. If you're terrified of Project 2025, keep in mind the Republicans will eventually win again, even if not this election.
If you're not in a battleground state, the easiest longterm solution is to vote 3rd party. This is the tactical decision to gather support and break the duopoly, without increasing Republican win chance since your vote won't affect the election