Can you recommend me some RSS readers that work with FreshRSS (Google Reader API and Fever API are also options)?

It would help if you mentioned the ones you tried and what you didn't like about them, what features you're looking for, etc. I still haven't found the perfect client myself.

I use FeedMe.

I use Reeder on iOS and Mac.

what platform?

I really like Newsflash on Linux. Clean interface, scraping built-in. I also found Feedreader in my repo which looks promising, but I haven't gotten around to trying it yet.

Fluent Reader. Choose Fever API as a service to use FreshRSS.