Over time I've seen plenty of comments like this one about platform A vs platform B and I find them all absolutely uninteresting. Having an active Discord server doesn't stop you from having active communities elsewhere.
Some people prefer Discord and they made a comfortable home for themselves. If you prefer a different platform (which could be a matter of personal preference or an objective advantage, it really doesn't matter which it is), then go make yourself a comfortable home there and start offering help to others on it.
If you're a newcomer and can't really offer much help, then you're asking for people who do have that knowledge to help you on a platform of your choice. That's certainly something you can wish for, but you can't demand it, regardless of how much objectively better your platform might be.