Using the DCA method to invest solves lots of these problems since it encourages more of buying than selling.
I don’t care about the investment methods used. Anyone is free to use their own way to invest. The focus is on making profits from the planned investments. You can use whichever investment method you like, but if psychologically, you can’t handle the selling pressure, your plan will fail too. Planning and knowledge are important so that investors can stay calm holding onto their investments.