Investing in Stock

Salam everyone, Unfortunately, I invested into GME stock before I did the research and found out that it was not a halal investment. Growing up in America, I never studied or really even heard about Islamic Finance until talking with my Imam recently. I invested with a clean intention, but if I sold now I would lose money. Would it be ok to wait, make profit, and donate all the money for Sadaqah? I would also like to ask for some good Islamic finance sites to learn more about it. Thank you all