That's true to earn higher profits you need to hold it long, but if you are satisfied with small profits then sell it whenever you see higher price then you bought.
You want to earn "high profits" in trading? Holding long is not they key. You are just wasting profits here if you want to hold your coins for really a long time.
If a person wants to earn higher profits, you need a large capital on hand to make it possible in just one price rally.