sell and buy back is best method to minim your lost 
but sometimes hold is best solution for long investmen
If I prefer long-term investments, because if we use the buying and selling method, this is vulnerable to incidents of cit loss. Here we can lose a considerable amount and are not very effective for those who have solid activity but sometimes hold is best solution for long investmen
Ya in trading, we will loss very very less amount as compared to inversing people. If the investor holding bitcoin now means, it's the perfect time to sell their holding bitcoin. Why I am saying this is, today the price of bitcoin is 3104$ today. It crossed the 3000$ wall now.So if you sell it now means, you will get very huge returns.