Request for a ban appeal in "lemmygrad.ml"

This is a repost from the matrix & mastodon channel. My account was banned on the platform “https://lemmygrad.ml” without any explanation & indefinitely after not using it for 1 or 2 days, here's my profile “https://lemmygrad.ml/u/abieNathanTheyThem”.

How can this be undone?