I have the same concerns. The 2018 midterms was a tune up.
They flipped 6-7 seats in CA after election day and the GOP did nothing.
California is well on its way to 100% Demsocialist. Vote harvesting is legal and they have the eager personnel to do it wholesale. Mail in voting which is done a lot in Cali is 100% Democrat because those who go around collecting the votes fill them in themselves or filter out Republican votes. Given the 100% support of the politicians in the state California is well on its way to being a totalitarian state with speech prohibitions and all the rest.