I've tried Revolt before and it is pretty cool. It also has some things that Discord does not have without modifications, like custom CSS that you can use. One missing feature that for me is a game breaker, was that there is no built-in gif search. But most likely this will follow in the future.

An alternative to Revolt that would be interesting to keep an eye on would be Spacebar (formerly known as Fosscord). It does sound promising from their GitHub Readme, but I did not test it yet.