First make a good plan, manage your risk and profit ratio, don't take more risk then the profit you are going to make, if you think for some X trade the risk is lesser and profit could be more then definitely go for it, even if the profit is not that much but risk is lesser then still go for that trade. (personal view, beside DYOR).
PS: Try to control your emotions and learn the sentiments that markets brings for us. Controling emotions is not a difficult task until you have good knowledge of FA and TA.
I have seen many people who are very good at trading but still make these mistakes. When the price of Bitcoin goes up they get frustrated and make the wrong decision is a tendency that works in many people at different times. There seem to be many of us who give advice to others. But when we open a trade we cannot control our emotions. Because we forget that we should control our emotions.
Honestly, it's all about us being humans. Sometimes we make mistakes because we are not careful, even though we know the right way to do it, we still end up making a mistake and it's normal and should not be a big deal. I personally do not care about it all that much.
I believe that people who know better could always end up being in the wrong sometimes and that is just the way the market works, because we are not robots. This is in fact why some people use bots to trade instead of trading themselves, because bots would not do anything outside of what they are told, and if you find a good strategy then they will just do that over and over again, without human mistakes. It's just not easy to find a strategy that bots could work with.