The way you put it, I would hardly even call it a democracy. Or let me rephrase that. It’s a democracy but a really broken one.

So the system would have to be fixed. And of course that won’t happen because it would damage the parties that would need to fix it. Yea… really complicated.

But at least locally, it should be fine to vote for 3rd parties. I see many seats there. You should try to get the choice in the places you can. (as long as the small parties aren’t even worse, of course)