I can recommend using Cloudron but I don’t use Radicale.

Cloudron is in no way a necessity for anyone - it’s simply me being too lazy to keep everything up to date, read all the necessary documentation for all the services we run,etc. Cloudron does all that for me - and I couldn’t be happier. Johannes,the owner, provides fast support (had two glitches with Hetzner DNS over the years) and the amount of Apps is getting wider each year, although I would rather see their range be broader (e.g. a proper Monitoring system instead of yet another project management),but that’s just me.

In theory it’s even possible to create your own apps for cloudron, both for public and private use, but that is beyond my capabilities. It can also be used as a SSO provider and reverse proxy,btw.