I determine it in following way. I put fibonachi on a chart, but I have another interpretation of this tool. Thanks to this tool I can fin future point of reversal. For example 9370-9300 is my zone to open long position to get 2000 points. And now I have short position on btc
This strategy is used even in gambling but as practice shows, you cannot count on it only. I think compiling all the information about the cryptocurrency, applying filters to it, is the better variant. The probability to make a mistake in your choice is lower in this case.
I also try to follow the market changes and check for the news referring to the crypto world.