One strategy I used when I was trading was that when I felt like it was a good time to buy, I would only buy with about 25% of my available cash. Then I had leverage if the price dropped. If it dropped, I would used the second 25%, and they still left 2 more opportunities to buy as the price dropped more.
This is the best way to earn from trading as we should not spend all our money at a single try but better make a plan for it. We should spend time and keep eyes on the market, most of the time we buy when the market falls and keep holding longer. I also keep my money investing until I feel I should stop as day trading needs allot of knowledge.