A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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You need different Subdomains as you suggested in your first paragraph. And add a reverse proxy like nginx or caddy to the machine which then proxies the different subdomains to the respective services (e.g. lemmy.your.site to localhost:2222, mbin.your.site to localhost:3333).
Theoretically, you could put a landing page behind some SSO/iam like authentik, and then link to the subdomains from the landing page, but eventually users will need be on the subdomain to use a specific site.