I use Reeder on iOS and Mac.

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.

what platform?

I use FeedMe.

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.