I would once again advise you to fix your narrative, be sure what story you want to tell and would like us to believe and take as a fact. The elements in your narrative keeps changing,
[...] I made two deposits in total: the first was $300, and the second was $800. [...]

They're clearly more than two deposits.
A few days ago, I registered and deposited money for the first time on the platform betcoin.ag.[...]
I registered on Betcoin.ag a few days ago, and I encountered problems after playing for less than a day.
To clarify, the casino where I won tens of thousands of dollars over several months was a different one—not Betcoin.[...]
[...] I’ve been with them for 121 days, which is about 4 months. Deposits, withdrawals, and gameplay have all been normal. Of course, my VIP status isn’t the highest, but it seems alright given that I’ve only been playing for 4 months.
[...]
So, final say, how long have you been in betcoin?