Can you tell us why you think BTC will reach $100k by the end of the year? Besides the leaked intel of such price at that time frame? What if the tides were turned around and BTC reached $10k - $20k by the end of the year? Then what?
Bitcoin still has plenty of room for exponential growth (with a few corrections along the way), before finally hitting $ 100k.
If BTC drops to 10k - 20k, what you do is buy more at a lower price. Do you think if the price of bitcoin goes down, it won't go up? Bitcoin has been around for a decade and it keeps getting up all the time.