Maark
With a 50% strike rate I would set up a bank of 20 units and bet 1/20th of the highest point that the bank has reached, never reducing the bet. If you double your bank remove 50% of the profit as a dividend for yourself and reset your bet as 1/20th of the new bank.
20 unit bank - double to 40 units - withdraw 10 units - restart with a 30 unit bank and a 1.5 unit bet.
I would also check which price ranges are the most/ least profitable as your data builds up.

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Dear Lord
Please let me break even. I need the money.