Feeling sad, looking for a place where I can gamble the last of my stack.
What sites can I gamble 50% BTC and double or nothing?
If you are sad, gamble your money away probably will not help a lot and will not produce anything of valuable.
By the way you can have a look on stake.com that allow huge bets (technically they have no limit).
You can bet on a casino (always there is house edge so it's not a perfect 50% bet) or on sport bet.
Personally I absolutely advise against doing such nonsense. It's an amount that even in a crypto winter could change any life.
I think it's more valuable make a donation to charity or helping people in needs...