Don't panic with this setback, being patient and holding it is the best way to save from loss. The market will definitely increase and never sell low if you don't want losses.
I think if you only know how to read indicators, it can save you from emotions (fear, panic) and prevent you from losing anything. This is because they will tell you when the price of bitcoin will be bearish in a few moments (hours, days and / or weeks) then maybe, you will know when to buy or sell your coins.
Most of them have answered your question here. But just to add a few points, when the market is red, try to diversify your portfolio on a number of coins that are worthy of the hodl and deserve to be sold immediately.