Hello,
I recently joined this Discord group, where everyone is a beginner and use various software: Krita, Moho, Synfig.
The group promotes art-related discussion and there’s a weekly challenge to make a simple animation with your software of choice.
Here’s the discord link 
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Nothing on OpenToonz/Tahoma2D, enve/Friction ? 
I didn’t see anyone with those softwares 