My trading plan is mostly i start buying when price start decreasing while i am start selling when price start increasing. But mostly i am holding my bitcoin for a time when i judge that i can earn now 12-15% profit then i start selling price even if price is continuously rising. I am not waiting for long time i have fixed my limit of profit whenever i am getting that profit then i started directly selling.
Personally, I think that the tendency for buying low and then selling with high are definitely a safe way than any other ways. As I know that most of us are usually in panic when the price is going down, even some cant control their emotion and then making some wrong decision which makes them regret a lot. When you choose the way with buying low and selling high, you are probably less of fear about the price. Moreover, you completely control your emotion in positive way which can help you get a big benefit from waiting.