Of course there is no more reason to sell now than there was at the peaks if you are right about the eventual utility of BTC.
One thing puzzles me. In the stock market the length of cycle (bull-bear) has shortened considerably and that is especially true for the bear periods. Perhaps this is due to the facility with which investors can move in and out of the markets...certainly the cost of buying and selling is much less than in say 1980. Bear markets tend today to be brutal but short. Crypto currency is very different from equity I know, but I find it interesting that the predicted length of this bear is so long. I am not selling. But I am not buying until it is clear that BTC has important, widespread, utility. That may take a while, if it ever happens.