My budget home server setup

Among the flashy racks you folks share in the subreddit, here is my budget home server setup.

Router: Unifi Cloud Gateway Max

Server: HP Compaq Elite 8300 SFF

AP: A generic ISP AP + a TPLink AP

UPS: APC BE850G2

Others: A £2 temperature monitor from Temu

Please let me know your thoughts on this setup. What else can I do to make the most out of the space and the server?