It has been over 7 months now and they do not reply to my emails and my funds are still locked

it's most likely because you haven't given them the proof of funds(that they deem valid) that they have been asking from you seven months ago. at this point, they have probably deemed the case closed as the gambler failed to provide the documents that they asked from you, that's why they aren't responding to your emails.
I do small tasks like writing, and designing and get crypto for that and I used that money to deposit and play. I don't understand how to provide the proof of funds. Assume you use your signature campaign earnings to gamble and it's not a valid proof of fund for them, then you will forfeit your money to them?