Buying back is usually an easily conceived idea which is hardly done. This usually comes due to investors not having enough funds to continuously buy more try to increase their hodlings by leveraging on Bitcoin’s volatility.
While this might work as a strategy, it’s usually left for those who understands chart analysis and can very well predict the market. This is very difficult to archive and that’s the more reason why you shouldn’t sell. Chances is that, you might sell while expecting the market to dump and when it doesn’t, it wouldn’t feel so right with you to buy in at a higher price.