The Discord needs to use Voice Master instead of manually creating channels

The Voice Master bot allows for users to join a starter voice channel and get moved into one created for them. It allows your channels to be scaled up or down easily without issue.

Here is their website:

It also lets users lock their channels, make them hidden, rename them, and more with commands. And what they can do can be tailored by the moderation team with ease.

I just tried joining the Discord to play and all the channels are full.