I would suggest giving Proxmox a go and virtualise your VMs, as you can easily make snapshots and recover if something goes south.

You can also check https://tteck.github.io/Proxmox/ containing easy deployable scripts to make your life easier.

I would also try to run everything out of Docker compose and create a repo containing all configuration files.

The whole idea of self-hosted is to build something yourself and learn your way around some new technology or software. Plus building something yourself allows you to change and upgrade it down the path, while Synology doesn’t provide any of the sort.