Base on my experience when i return or deposit again after i lose my deposit will make it even worse instead of winning back my losses, i lose again the new deposit. So what i can advise to you is do not try to win back your losses, if possible stop gambling even if it makes you happy for a bit of time, i prefer keep holding bitcoin and in the future it will make you more happy than gambling your money.
Thats how this gambling industry grows and makes money. Every time they give amazing offers to customers and most of the gamblers who accept these offers are those who had already lost money in gambling. They have vain plans of getting back what they have lost. What you have experienced is nothing new, it is happening with every other gambler so this is why gambling is considered evil and destructive game.