Do some reading. There are a lot of solutions. The most obvious, as you brought it up just to dismiss it, is direct democracy. Everyone votes. There are other options too, like a rotating panel of representatives, so no one has lasting g authority and everyone shares in it.

There are people smarter than both of us who think it's a good idea and have thought of potential solutions. Before you just dismiss things out of hand, you should actually look into what solutions have been thought of before. I promise you your thought isn't unique, and people have considered how it would work. Maybe you can learn from it, even if you don't agree with it.