The place I've moderated for the longest is CCO, otherwise known as Cow Chill Out. This is where I started my moderation journey, and haven't regretted a moment of it.
Everyone over there is super nice and polite, and I recommend you join it for a number of reasons :)
The server has mostly died off in recent years, however the memories of it remain.
Role - Moderator

If you'd like to join CCO, click the embed on the left or visit https://discord.com/invite/8x8xDcAXmc.

I was around in discord.fm for a while before becoming a moderator, and it has now shut down. They were extremely cool to work with while I had the opportunity to do so. :)
Role - Moderator

If, for whatever reason, you want to still join the server, you can click the embed or visit https://discord.gg/dfm.

The Rythm team was absolutely amazing, and were all extremely cool people to know and interact with. This server specifically is Rythm's brand server, where you can come to share your experiences using the Rythm activity among other things.
Role - Moderator

If you'd like to join the Rythm HQ server, click the embed on the left or visit https://discord.gg/rythm.

I've been a moderator for a decent amount of time, but I've been around in the Vitamin Games server for quite a while now. It's a community all about the development of Vitamin Games' passion project, Project Arrhythmia.
Role - Overall Manager

If you'd like to join the Vitamin Games server, click the embed on the left or visit https://discord.gg/projectarrhythmia.

The Workshop is the place to go for all things airsoft and gun related. I moderated here from May of 2023 to August of 2025, and I feel like it really helped me branch out my moderation skills and abilities.
Role - Moderator
I left Workshop as a whole as the community became something I didn't see myself wanting to stay in any longer, and I deemed it necessary for my own mental health to leave. All of the staff are fairly nice but the general community may not be the most welcoming anymore. 
If you'd like to join The Workshop, click the embed on the left, or visit https://discord.com/invite/6hBQskVm3z.