My dream has not been shattered after all

This is my updated and minimalist minilab.

A few days ago I thought I would have to send my Rackmate T1 back because the dimensions given were wrong and the rack wouldn't fit in my cupboard. Thanks to the idea of a fellow redditor, I managed to lower the height of the rack by 5mm by turning the top horizontal aluminum rails 180 degrees.

My homelab currently consists of: - Dell Optiplex 3060 (Proxmox with multiple VMs like Homeassistant, Paperless-ngx, Jellyfin, Wireguard, NGINX Proxy Manager, ...) - Raspberry Pi 3 (Miracast over Infrastructure to the TV) - Raspberry Pi 4 (Retropi) - Synology DS224+ (Storage and VM with Proxmox Backup Server) - APC BX950MI UPS (Connected to Homeassistant wich shuts down NAS and Proxmox when Batterylevel Drops under 50%)

What should I add next?

In case anyone is concerned about the temperature, the hardware has been running for 2 years in a compartment next to it in the same tv board and I had no problems at all. I have removed the back panel of the compartment so that warm air can escape and I monitor the temperature of the hardware as well as the temperature in the compartment. If I get problems, I will install additional fans.