if you want more users you can host headscale instead of using tailscale, users can still connect with the regular tailscale clients

additionally you can use forward auth on your reverse proxy using something like authentik so that users have to be logged in before they can even see the service itself. personally I trust authentik more than I trust all of the individual services which might not have the same level of scrutiny applied to their security. it also has the added bonus of letting your users use SSO if your services support it.