If I assume you are currently a short-term trader or investor and are more trying to be patient and wait for the momentum where you have to enter when you feel it will be profitable and exit when you feel you have enough profit.
This may be the best way if you are comfortable with it especially if you are in altcoins whose prices will certainly decline and rise quickly due to the movement of bitcoin. But because I don't really see altcoins as an option and focus more on bitcoin, I won't do this method because instead of doing that and selling the bitcoin I have, I am happier waiting (leaving my assets in bitcoin) and continuing to add to my assets when the price drops again .