What Could I Add Next - need suggestions.

So I only use HomeKit as the main interface but multiple different ecosystems, all the rooms in my house have something smart but looking for idea on what’s next.

Lighting - every room and garden kitted with different Hue bulbs, gradient strip, bar.

Heating - Tado, smart thermostats and radiator valves throughout.

Aqara - Camera, Door bell, windows and external doors all fitted with sensors. Internal switch to turn on/off Extractor fans, temperature sensors, motion sensors for lights. Roller blind controllers.

Meross - smart plugs for wax melt diffuse, and fairy lights in the garden. At Christmas the plugs join Christmas decorations along with Twinkly.

What else do people have? Based in the UK so getting some stuff seems to be hard.