Google cloudflared tunnels, zeroteir and tailscale. They all solve this exact problem, I've been using cloudflared tunnels to host without exposing my ip for while now, it's relatively easy for https services.
Edit: also just because services require login, doesn't necessarily make them secure if their implementation is terrible. It's best practise to use a reverse proxy like nginx which specialises in having not shit security for authentication, and proxy your services behind it.
Yeah that's it. Yeah anything that needs api access needs it not on that bit, and anything with a mobile app can't have it either ๐ข