You could look into apps like authelia, keycloak, authentic, etc.
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If you're comfortable with using Cloudflare, you can use their zero trust tunneling and setup an application layer that adds auth to those services. I have mine protected by my GitHub login.
Oh interesting. I'm using zero trust tunneling already to get through my ISP network chicanery. How would that work? Do yo uhave any tutorials you can recommend?

You can secure your tunnels using the Access menu and then adding an application. It should be somewhat straight-forward but you're basically looking to create an access policy and then adding the rules you want. For example a simple one is to add an allow rule for certain emails. When you enter your email an access code will be sent to you before you can access the application resource. That's just one of many ways to secure it using their application config and access policies.
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