As others have said, a Raspberry Pi 4 or 5 will do everything you need for HA short of voice support.

If you do want to set up voice recognition, honestly, my first stop would be Wallapop/eBay. You can find something marginally more powerful than a Raspi that way if you don’t mind the additional power consumption. Or, given what’s out there, I’d try to put something small together as a bit of a project from used parts.