How if Bitcoin is not down deep? Do you want to buy Bitcoin? You don't have to sell to buy back but keep buying Bitcoin will be good for you.
If your target is long term, you should just buy and hodl and no need to worry with anything. The correction will be besides Bitcoin and that will always happen. The thing is you have a chance to buy back and hodl.
If you use DCA method, you will not sell in the near because you want to use Bitcoin as a long term investment. Still holding Bitcoin will be the best.