Time will teach you a strategy.. You have to make some loose along the way to come up with a personalized winning strategy.

I bought debt coin for 6k. And in 6 months it became  600k. Today it is down and my 6k worth investment in  worth  60k. So best time to sell was when dent coin was at the top - 600k

Take  another example, let's say pundix. My  5k investment became  60k last week  & not it is worth  40k at the  time of writing this post! Best time to sell  pxs coin  would have been a week ago..

With experience you will be able to identify these opportunities related to timing of selling coins or flipping around