Bittrex currently has a hard time managing the information of users, anyone who does not perform KYC or provides enough information, they have enough reasons to lock your account.

I think this is the rule of the game at Bittrex and you should follow it. The fastest way to handle this is to DM directly to Bittrex supporters on Telegram so they can assist you as quickly as possible.
https://t.me/BittrexGlobalEnglish

This is the telegram link that leads to their official group, and wishes you will be able to reopen your account soon.