large discord servers are literally impossible to communicate in, honestly. it's specifically for certain personalities to scream into the void and everyone else just kind of becomes background noise. i recommend muting pretty much all the channels but like the important ones (aka the #memes channel

), and also disable the "accept dms from people in this server"
but like for real, the reason i like zd is that you can get to know people, and its just easier to communicate on this smaller scale. having an entire fandom 'population' in one place as disorganized as discord is sooo excessive and chaotic and overwhelming.
it's hard to find people by interest nowadays who are worthwhile chatting to, but if you have existing friends who are into demon slayer, maybe you can network a little bit and find some similar minded people who also share the interest. dont know exactly how to go about doing that, but maybe you could find some people through a mutual interest in art, if they like your demon slayer art, they may also be fans of demon slayer.
but also, real friends support your interests even if they dont necessarily share them, and thats something i've had to learn the hard way.