If you hold a cryptocurrency that is included from the red marks from the market then this is not the right time to sell yours. You should buy more now instead of selling it. This is our great opportunity to make profits in the future.
of course we have to predict prospective coins to hold, because if not of course the waiting is in vain. but I prefer to buy coins that are safe like bitcoin, so as to minimize the risk, because I am not yet good at analyzing
Why do you think bitcoin is a safe investment? Last year it lost 80% of its value. This is clearly not an object for investment. All cryptocurrencies are an object for speculation and it does not matter how much it costs at the moment. You need to constantly buy and sell it. Then you have a chance to earn. Hold last year proved its inexpediency.