Hai! Sorry to hear that. I've checked and you're not banned in my server. Something must be wrong with your account.
Maybe you're underage, those aren't allowed in the discord server, sorry.
I am not underage as I am an adult and I was allowed in discord until recently. I have been able to re-login into other discords so I don't think it is problem from my end. Maybe send a invite link to me directly or other methods?
By the way, I love your game! Your game is one few games that I play imimmediately after the update. Keep up the good work!