I use Koreader. It’s a bit heavy because it has basically any option you can think of, it works on a wide multitude of platforms, and can have weird bugs sometimes but hardly ever. But the way I read, I need some settings that aren’t in very many readers and it has them. Try it out.
The algorithms killed the platforms. They've become vapid, empty holes that only attract people addicted to them like junkies.
The internet can be fun, but you're not going to find it on the platforms. You're only going to find fun in places where people talk to each other. And even then, if you're thin skinned you're going to wind up in an outrage filled circlejerk. If you loosen up and go where the algorithms don't exist you can have a good time.