In case you missed it, there is now a Fediverse alternative to Strava called Wanderer:
There is a public server list at:
➡️ https://wanderer.to/servers
To sign up on a server, click on "Create Account", then "Login", then "Make One".
If you're running your own public Wanderer server you can add it to the list at https://github.com/Flomp/wanderer/discussions/361
Techy people can self-host using instructions at https://wanderer.to/run/installation