Curious about what time you were referring to when Democrats were better. I suppose they were OK during Obama (ACA was a corporate-friendly solution, there was a huge wealth transfer from the government to financial institutions and corporations, there were tons of drone strikes, and anti-immigration ramped up though). During Clinton they cut social programs significantly, and implemented the draconian three-strikes law.
That would require people attend all Democrat primaries for all positions otherwise you end up voting more magats in. For example, Beto is up again for Texas governor. Please don't vote him in to run again. That would be yet another guaranteed win for Greg Abbott. Literally pick anyone else to run against Greg.