You can definitely look into options with Corvid.
If you want it to be a non-private site then you need to implement some authorizing system.
We have a built-in members area in WIX (Site Members: About the Member's Area | Help Center | Wix.com) however, you can create your own which gives you more options to customize it.
It is not a built-in functionality in Wix however you can code it yourself using Corvid APIs. Take a look at the article:
https://support.wix.com/en/article/corvid-tutorial-building-your-own-members-area
which is a step by step guide on creating your custom members area.
You can build the interface and set permissions yourself according to the needs you have and have more control over your site’s content for specific members, roles etc
After that you can add different functionality for your website according to your needs - add Blog (custom blog feed as shown here:
https://www.wix.com/corvid/example/custom-feed )/ Forum / other features
This can also give you an idea on what you can do:
https://www.youtube.com/watch?v=aWHSqONtSoQ&list=PL-m-hYpBsNRoFvJHfOroU2_cWXS896dIQ