The phrase buy the dip is only a good advice when you apply it properly by buying the very good altcoins whose value is only down because of the bearish market condition. Because it is not all coins that dip that would recover their value.
For example, early this year (when the market was super bullish) almost all the projects released saw good increase in their value. but that doesn't mean it is all of them that were very good projects. After the market dip (correction), most of them never recovered their value. The crypto market is filled with a lot of scrap altcoins and the market way of sheding them off is to dip (correction). So it would be in your best interest to only buy very good coins in the market dip.
All coins do not give a definite reason if it has gone up it will go down again or vice versa, this is what many people call an unstable cryptocurrency world, even though we have often seen conditions like this in crypto, from the beginning we joined here.
Correction is the stability of the level of market influence that occurs, this continues to be done if a problem has not been resolved properly, that's why purchases are not always good when the coin market is down. If you want to be safer, then buy coins that are more stable in the market than risk high risks.