Advice for best spec running HA

Hello, just wanting some help choosing the best option going forward.
Currently using Pi4 4GB with ssd drive

Recently added Reolink cameras x6
Shelly devices x 50
Philips Hue devices , 40 (switches plus lights)
Some other devices as well, (ie; water meter)

Currently Processor on Pi4 up ad down between 18% and 45%

Thinking I might be better upgrading to a mini/micro pc or NUC.

Can I have some suggestions as to what is a good spec to go with,
ie; Processor i5 / i7
Processor speed??
Ram ??
SSD size?

I’m thinking the pc based option may do a better job that what my Pi4 id currently able to do.

Kind regards,
Damien