I strongly believe you can do both the selling and holding(waiting) of bitcoins, and at the same time grow your holding & make a profit from it.
Too many amateurs get burnt trying to buy low & sell high. Personally I advocate HODLING as a fool proof way of making profits.
You might have to wait a year or two as has been the case at times but throught bitcoin's lifetime the price has risen over time.
This time, it won't take too long for everyone to be rewarded, because once we see BU failing on its assumptions, nobody knows where will Bitcoin go (up only). So, it's currently the best time to wait for some days and see the market's trend moving in our direction.
Yes better to wait and watch without doing anything to our bitcoins as everyone is hoping that price will again rise in next few months so looking at that prediction its better to hold our coins till that point and if you have a feeling that this is a good price to buy then you can buy bitcoins now.
If you hold and you don't panic you are making a great decision, just be confident with your decision and let them dump theirs.
Let's remember that when we are investing in a long term period we need to have a good amount of patience to survive, in the end this is just
for our own good and once you sell and see the price pumping, you will clearly regret you decision.
This investment is for the risk taker and you must be willing to lose what you invested, doesn't matter where you sell as long as you do it for profit.