Trade for Sp500? Are you out of your mind? So that you can start losing purchasing power against bitcoin? You bitcoin it's there giving you time. Fiat need yield and interest that is paid with inflation. Sell your bitcoin for something that can change your life. Like a house, if you can get a small loan using bitcoin as collateral better. But my advice is, bitcoin is savings tech, you don't gamble your savings. Keep it for retirement,for some hardship in life, for your kids, or to buy something life changing.