I'm moderator of a fairly large subreddit (800K subs) and I recommend to PM a Reddit admin. I can't guarantee they will help getting the account back nor increase your permissions but it is better than not trying, if you need a few names just ask.

The subreddit is also in need of fresh and clean CSS. Clear rules should be in the sidebar (If the sub has rules). To increase the subreddit quality steemit posts should go on /r/steemitposts and only steem related information should be on /r/steem. Also a "call to action" to sign up on steemit should be either pinned or in the sidebar.