Having worked in an international environment for over a decade makes me 99% sure that OP speaks Portuguese.

I’ve been using Capy Reader as a frontend for FreshRSS for a while now, and I love it. It’s flexible and intuitive.

It’s not useful to discover new content though, I guess you’ll need a different solution for that. I usually just search a topic and RSS and try some feeds. I keep the ones I like and remove the rest.