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Alright, buddy! I understand your situation; it's like driving into a ditch, you need to find a way to get the car out. The long position at ETH 3800 has now dropped to 3650, equivalent to buying at 3800 and now the market only values it at 3650, selling hard would mean a loss of 150 (per ETH). Don’t panic, let me teach you a few 'car repair' tricks to see what suits you:
Lay flat and play dead, wait for rescue (hold until rebound)
Most commonly used and also the most challenging for mindset. Just hold on, believe that ETH will eventually rise back to 3800 or even higher.
Advantage: Simple, no need to put in more money, and if it really rises back, you can break even or even make a profit.