"Webring".... good lord, that takes me back. :)
Bristlerock
I'm on mas.to. Chose it because it's got a decent UK presence (but isn't a UK-specific server), is quite popular, and the admin runs it well.
This is pretty much what I'm doing.
If sub.rehab shows 5 threadiverse alternatives for a subreddit, I'll have a look at each and often sub to 2-3 with the highest subscriber count/posts I like. I'll then monitor them over time to see which, if any, to unsub from.
This last sentence is the crux of the matter. People don't like change, but quickly forget that they spent time learning the site that they're so familiar with.
@Mathusalem It is according to sub.rehab*, a site that lists alternative homes for subreddits. But this magazine is 2 weeks old, so it's early days.
*Not sure if everything it lists is genuine/accurate, but it does let you filter for "official" alternatives.
DNS-O-Matic (recommended by CloudFlare, among others) combined with SWAG and Authelia will handle dynamic DNS, reverse proxying, SSL certificates, and MFA. SWAG (nginx, Let's Encrypt and Certbot) and Authelia (MFA) run nicely in a 2 container Docker stack.
Mine have been running for ~18 months on my NAS, though I have a fixed IP so no longer use a DDNS provider.