Querent asks, will I profit if I put some money in an S&P 500 index fund?
For questions of profit from your own money, we will look at the condition of Lord 2 (Mars). Mars is peregrine and combust. I you wanted to use Lord 8 (Venus) as other people’s money, Venus is in fall and there is a separating conjunction with Mars.
This looks like the querent will lose money if they invest in the S&P 500. The S&P 500, while not an all inclusive representation of the stock market, is a good indicator of how the overall stock market is doing.
I recommended he keeps it in cash for now.