Bitcoin trading is on of the best way for making profit by using of buying low and selling high.
Most newbies end up buying high and selling low. Its called FOMO, in case someone is wondering. Lack of patience and knowledge leads to that.
Honestly, I don't use existing formulas like OP said, I only rely on Fomo, and pay attention to the instructions on the channel I follow if my heart says sell I will sell, and buy when the market really falls like it is today