It's Sunday somewhere already so why wait?
Let us know what you set up lately, what kind of problems you currently think about or are running into, what new device you added to your homelab or what interesting service or article you found.
I'll post my ongoing things later/tomorrow but I didn't want to forget the post again.
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.