Stop doing it?
well you should look at your success rate history for at least a year and see if you were only getting lucky and making profit or were you actually making profit because your analysis was good and closest to reality and that made you make profit.
if it is t he former then you must stay away from trading and if it is the later then continue doing it.
but i'm guessing based on your topic title your trading strategy might have been more like a shot in the dark that sometimes hit the target in which case you might want to make some major changes in your approach.
Well you need to better check if your earning is quite continues atleast a bit a month or probably a year too for the sake of your money. Gettig lucky is very hard to get, it might comes in our life but not always. Make some analysis in the stock market and make it a basis in making some decision in investing. The best way also to earn and gain more profit is be good at making decisions and strategy. Knowledge is a good thing that one person can have that might help us on our life.