I just made a community like this (link to join): https://orgmanager.miguelpiedrafita.com/join/33991610
I created it based on what you described.
You can read the complete thread here: Join an open-source community
There’s also the Chingu Cohorts as @ellereeeee mentioned. You can also check out codebuddies.slack.com, which is a great community of learners, as well.
EDIT: In order to access the codebuddies slack channel, you need an invite: https://codebuddies.org/ Select “Get your invite” to start chatting.