Played here last year, skrill and crypto withdrawals take about a week to get completed. They are enforcing KYC in your case, which is normal, this casino enforces KYC upon the very first withdrawal if I remember correctly, verifications takes around 5 working days, I remember that correctly, in my case I only had to provide my ID, proof of address and the proof of payment if I remember only required a screenshot from the wallet I used to deposit.
Due to the amount you got in your account they had to enforce a proof of funds, which is also normal in specific cases (when withdrawals or deposits are too high compared to your average transactions), you can explain them your situation, not everyone has a salary, I consider giving them a bank statement with the required period to be enough as long as it shows the deposit you made to the casino (or a related transaction), which deposit method you used? If you used a card then this is easy to spot in your bank statement, if you used an e-wallet, you probably had to deposit first on said wallet and this transaction is visible in your bank statement.
Definitely not having a salary complicates the case, but explain thoroughly how you got the funds you deposited and you should be okay, also have in mind there is a max withdrawal amount and they will probably pay you in installments when your account gets verified
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