Seems people are already making great recommentations.
Personally I also use docker-compose, a WireGuard VPN and an Nginx-Server to proxy/ssl-terminate all my services to my VPN or the Internet.
Just host whatever you like/need. Something like Nextcloud is probably a solid start.
Btw, I have not seen it mentioned here, but awesome-Lists are a thing on github where people collect various gems for certain categories. Here is the one for self-hosting which I have used extensively and really like: github.com/awesome-selfhosted/awesome-selfhosted
Also, when you start hosting more than 2-3 services, keeping them up-to-date might become a hassle which you can forget. For docker-based hosting I’d recommend you setup watchtower, which can keep your servives up-to-date for you.