Project 2025 sounds like a silly wet dream by an independent organization, I'm not too alarmed about that.
As for the Supreme court, there's no turning back on their decisions no matter who comes next. There's only adding an amendment, and I'm not too sure the US is flexible enough on that (the last one was ratified in 1992)
If someone wants to vote for Biden, the reason shouldn't be Supreme court, and shouldn't be Putin (who is publicly rooting for Biden btw, he would be spooked by Trump).