yes I agree with you I also always give a target when I will sell my coins. when the coins that I hold have experienced a 50% increase then I will sell them. if after selling the price of the coin goes up again I will not regret it because I already made a profit. but if I continue to hold the coin too long without a target and keep hoping the coin will rise again. I will be disappointed when the coins go down because they do not get profits because expectations do not match reality.
This is not a bad strategy but do you have any way to get back in the market if the coins you were holding keeps going up? I ask this because it is easy to say that if you earn 50% you will be happy with your results but how many people were early adopters of bitcoin and sold their bitcoin for a cheap price and they are now regretting their decision even when they got profits out of it.
A trading strategy in order to be complete not only should tell you when to get in the market and out of it, it should also have a way to tell you if it is good idea to get back in a coin which you have recently sold.