Need $300. Do or die.

I need to turn $420 into $720 and blackjack is my only hope. If I don't win this $300 I am good as dead and will have to commit suicide. Only 2 options.

Please no judgement. These are my only 2 options and I am "at peace" knowing it's going to be either or. Would like to win the $300 but have no problem dying if I don't. It is what it is.

So what is the best way to get that $300 i was thinking $10-$15 hands to start and raising and lowering bet depending on flow of the cards? I think it gives me a better chance than starting at $25 or $50 and lose a few hands and I am broke.

So what does everyone suggest?