Advice for Setting Up a Beginner Home Server (Pi-hole, Home Assistant, Immich, etc.)

I’m running Proxmox with Home Assistant, AdGuard, a server, and several other apps on my HP EliteDesk 800 G4 Mini PC (Intel Core i5 8th Gen | 16 GB DDR4 RAM | 512 GB SSD), which I purchased for 11k from Amazon (New Jaisa seller, a publicly traded company). It performs well, and I’ve never felt the need to upgrade. Typically, it consumes less than 10W of power, and when idle at night, it drops to only 5W.