You can buy more, and once the price goes up you will see a value greater than $5 but just like last time, it will go down again. You can't be like this forever but you need to take an action. Why not sell your coins once the price go up? So that your profits won't be dragged down anymore by the time the price go down but you can buy again during that time. You can repeat these two processes until you reach your desired profit.

That is the best way to generate a profit during the bear times. The term for that by the way is trading or it can also be called short term investing but if you are not bothered about the ups and downs, you can also do long term investing.