Why does everyone keep reelecting them? Vote for someone else. We also need a better voting system than first past the post.
Due to practicality and congressional gridlock, this has to happen state by state, and in many states the 'easiest' method is some sort of ballot initiative. I encourage anyone who reads this to look up the process in their state (https://ballotpedia.org/List_of_ballot_measures_by_state) and at least try to get a signature out to one so they show up on the ballot.
California runs an open primary and a top two general.
I'm not especially in favor of short term limits, since there is a benefit to politicians with experience. But I'd definitely consider options that better balance their reasonable desire to elect experienced and influential candidates with the very heavy hand that experience puts on everybody else.
Heck, California has gone so far as to have all their senate elections be between two members of the same party.
Most other votes will be largely sublimated to the party priorities. The individuals will determine the specific contents of what they're voting on, but in general the person from the other party is going to vote against the things you're most interested in. You may watch your party vote on things that aren't your favorite, but it's unlikely they'll be repugnant to you. That's how they got to be your allies.
If you want to get more involved than that, you show up for the primaries. That's a multi-way contest to find the person who best represents you and your allies. That's where the party priorities get set. People who vote only in the general election are missing out on the real work of politics.