we actually will not know when the exact dip will last. Today dip may be still continuing and tomorrow maybe more than today's dip.
That is why the indicator may help us to see the chance of the price moving, whether it may have more chances to rise up or even to drop again.
And I commonly will do some of these steps both for Bitcoin and also Altcoins:
- Analyzing the market and also indicator whether the chances may be dip again or not.
- If we think that the price has been in our own resistant consideration, I will commonly buy the coin by percentage, and this is not for all in. Because, we will not know whether the price will continue dropping or rising up. So, if  we want the coin, we can get them in some different prices.
But once more, each person will have different strategy of buying and selling