Any universal remote out there that can control mostly everything?

You can probably still find a Logitech harmony with a hub, but you’ll likely overpay since they’re no longer produced.

Newest alternative would be the Flirc 1s but it has a few drawbacks. It requires non-rechargeable batteries, and it only works with IR (and CEC, which from experience does pretty well with FireTV).

You need line of site. There are some great adapters for distribution for this if you need them


ETA- if you hate CEC so much, they do sell an adapter specifically for the FireTV (their primary product is a USB IR receiver. The universal remote world is new for them)