What about BuddyPress ?

Plugins RepositoryDescriptionAre you looking for modern, robust, and sophisticated social network software? BuddyPress is a suite of components that are common to a typical social network, and allows for great add-on features through WordPress’s extensive plugin system.Aimed at site builders & developers, BuddyPress is focused on ease of integration, ease of use, and extensibility. It is deliberately powerful yet unbelievably simple social network software, built by contributors to WordPress.

 DescriptionAre you looking for modern, robust, and sophisticated social network software? BuddyPress is a suite of components that are common to a typical social network, and allows for great add-on features through WordPress’s extensive plugin system.Aimed at site builders & developers, BuddyPress is focused on ease of integration, ease of use, and extensibility. It is deliberately powerful yet unbelievably simple social network software, built by contributors to WordPress.

Members can register on your site to create user profiles, have private conversations, make social connections, create and interact in groups, and much more. Truly a social network in a box, BuddyPress helps you build a home for your company, school, sports team, or other niche community.

Built with developers in mindBuddyPress helps site builders & developers add community features to their websites. It comes with a robust theme compatibility API that does its best to make every BuddyPress content page look and feel right with just about any WordPress theme. You will likely need to adjust some styling on your own to make everything look pristine.BuddyPress themes are just WordPress themes with additional templates, and with a little work, you could easily create your own, too!

A handful of BuddyPress-specific themes are readily available for download from WordPress.org, and lots more are available from third-party theme authors.BuddyPress also comes with built-in support for Akismet and bbPress , two very popular and very powerful WordPress plugins. If you’re using either, visit their settings pages and ensure everything is configured to your liking.The BuddyPress Add-onsWordPress.org is home to some amazing Add-ons for BuddyPress, including:

• BP Attachments
• BP Classic

NB: BP Classic is a backwards compatibility Add-on for BuddyPress 12.0 and up bringing back the BP Legacy URL parser, the BP Default theme and BP Legacy widgets.Go to BuddyPress profile on WordPress.org to find them all

From ldx.design/buddyboss-vs-buddypress/BuddyPressThere really are almost no positives to using BuddyPress over BuddyBoss.
Pros
Free

Cons
Not frequently updated
Very difficult to customize
Old, outdated design
Poor, outdated documentation
Little to no support
Few direct integrations