I don't really have any tips at all.
Just try do more stock trade. But if you not so confidence with the lost which it happened most of the times. You can saved the game when you noticed the Price of the Stock is dropping dramatically. After you save the game. You load in and buy all the stocks and go to sleep for 8 hours and then go check the graph to see when it at maximum and when it at all time lowest.
If you notice there's a all time lowest. You can go load the same back. This time don't buy but go to sleep try to match the all time low time and buy the stock.
But again I'm not gureenteed it would work. Imma try make a video testing.
Look I made 50M$ from a single stock trading
Edit : here is the video




