Use a reverse proxy to proxy everything through https, then you can install how many services you want. Caddy is super simple, you can reverse proxy with just 1 line.

For calendar and contacts (caldav, cardav) Baikal is extremely easy to install and use. And pretty minimal.

Slowly switch to Linux devices, or dumb phone, and learning to adapt happily living without some features, but also without control and censorship :)