I have checked and found out that your account is not deleted or banned. Your account is still alright.
As for the question, you could try to:
Reset your password,
Reset your username.
If none of those 2 works, then it's best if you contact the admins in Discord. They will be there to answer you.
In the case that I could further assist you, may I get a picture of the system "not allowing you in" . Does it say anything above when you press "Login" ?
Eternity0867's post in Hacked account? was marked as the answer