I will not be able to show us the historical data on how the cryptocurrencies market has been behaving in the past and how the accumulation and distribution cycles has been playing out but most of the time bitcoin and altcoins do come out stronger! I will still encourage us to keep holding and wait until the condition of pricing turned around again.  If you sell now you will be regretting when bitcoin get to $50,000 or $200,000 in some years to come as it has happened before and most times we regret selling too early. 
Keep holding and the future is for you!