Right. Just buy when the price is low, or when there is bigger buying opportunity. For sure that would create a big advantage on you when it's already a selling time.
the only problem is when the dips of the dips appear and it causes turmoil in our psychology 
. I mean buying the dips and finidng out that there are bigger dips just kinda scary isn't it.it's like catching falling knives, we can get hurt from it, but if we don't do it, we won't get any opportunity to flip money at all.
but as far as I know, if the dips is so deep it looks oversold enough I think making profit is easy.
just see this chart and observe how when the dips is too deep that it massively oversold, the price went back up instantly.