I know it's not for everyone but I feel like people forget that if you get frustrated with politics these days, you can run for local office and make bigger changes than you think. Every little change helps, especially in a large town to small city where you can do campaigning without significant funding.
I doubt many people have the extra time for it, but if you're retired or passionate you can make a lot of difference in your local community.
Sorry I am an American and I'm not exactly sure the processes in this subject regarding other countries, but I imagine many are not too different.
At least where I am, there are some important and influential positions that are on a volunteer basis, and literally all you do is email someone in the town, say "I'm interested in this board/committee", and they're like "cool we meet every other Wednesday, see you then".
I definitely encourage anyone who is pissed off at feeling powerless to look at your town or city's website, see what boards and committees might interest you, and start showing up.