It's worth mentioning we did have a Discord, but not anymore. In my view there are two main issues:
Discord is not indexed by search engines meaning that we eventually just have the same discussions over and over and that anyone running into an issue has no easy way to Google it.
Overmore, there's an expectation of immediate replies with Discord. People generally would come in as guests, ask a question, we'd reply a few hours later and they'd already left meaning it was a complete waste of everyone's time. (That said, if you do want faster replies we offer donation support).
Ultimately I think the general move away from forums to Discord is a mistake for many communities.
https://news.ycombinator.com/item?id=28549739
https://meta.discourse.org/t/please-stop-closing-forums-and-moving-people-to-discord/203845
https://www.mooreds.com/wordpress/archives/3451