I would actually recommend you check out the ZDoom Discord
It has an #3dge channel and it engages with both the 3DGE and ZDoom community simultaneously. If/when 3DGE grows to needing more than one channel it would be possible, obviously, to move 3DGE to its own server, but for now we feel this is a benefit for both communities to share the same one.
Anyway - both myself and Coraline are there, and I would recommend others come too. You can identify yourself as an 3DGE user in the welcome room and you'll still be accepted.