I’d recommend waiting a bit. Thread (network) and Matter (protocol) are finally gaining traction, and is poised to become the de facto standard across all major platforms (Amazon/Apple/Google). Buying Zigbee/Zwave/WiFi/BT gears now is literally buying gears that’s going to be outdated immediately.
Once you get interoperable devices on the better standards, you’d then be able to layer on with all-local setup easier.