Biased because I help the site run these days, but I came in as just a fan (and am not a musician). Once I tried all the arrangements outside of the games I was nostalgic for, I only then realized how special this site and the community was.
If you’re interested in video game music, music production and collaboration, there’s arguably no better place to get better than here. In terms of other VGM hobbyist arrangement communities, other places have more relaxed standards (not inherently a bad thing, just different, and OCR started the same way), and in terms of pro audio communities, it’s oftentimes difficult to get in depth (or civil and constructive) feedback.
There also the Discord server, which you should join at https://discord.gg/VABjqGa.