I have fully verified account. Where I can ask for invite?
Look this:
How do I get invited to the Bittrex Slack channel?
In order to better protect our customers and comply with Slack policy, Bittrex Slack invites will only be available to users whose accounts have been Enhance Verified. The Slack team and Bittrex have created this requirement to help eliminate spam, phishing, and general abuse.
As of this writing, the Bittrex team is still working on a mechanism for our enhance verified users to be invited to the Bittrex Slack channel. Please check back later for further instructions.
you can only hope and beyond that, you should not be offering money for people to help with the invitation because there are many scammers who can cheat and rob you and then you just leave again losing
many people write that the only slack can help.
Have you seen anyone who had their problem solved in slack? I see hundreds of people complaining on twitter of bittrex and I have never seen anyone say that they had their problem solved in slack