Oh you “tried” but it turned out to be hard. And THAT is why they get to do whatever the hell they want. So many folks find that anything beyond complaining is just too much effort. Getting involved isn’t a one shot deal, it’s a commitment. If you want the local party to change, you need to WORK AT IT. You successfully identified the problem, but couldn’t be bothered with the solution (find the alliance of people who want to dump him, there’s always some, and HELP).
Oh please spare me. I have been poll watcher, worked the booth at fairground when no one else showed. Worked headquarters, manned phone banks for weeks, walked neighborhoods, typed hundred of pages of voter lists at my home till all hours. Sell it somewhere else. You have no idea. You can keep your advice.