It is not always easy to determine the entry point. I agree with you on this. But nothing is impossible. If you constantly study trading and improve your level, then your trade will bring you profit.
Getting profit really depends on your entry and exit points. And yes, it is hard to determine such vital points. But if the OP will give up easily, he will not learn his personal tricks to attack crypto trading. And also, if you are into trading of a specific coin, he should do some studying of that coin, check their social media channels, because you'll never know, you can get hints from the developers if they are selling or buying. Trading is not an easy task. It requires patience, time , and resources. So you should be ready to face these troubles when you are into trading.