Once you make your determination on the coin and is likely not to have too much gains in the market then i will recommend dropping it for more better coin or BTC But for the potential ones you might never know so keep hold onto the better ones and lose those that are ineffective
one way or another, one must be able to draw conclusions regarding one company or another in order to determine the most promising projects and the best coins for investment among the total number of cryptocurrency market. This is very difficult to do, since even good test results may be ineffective.