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.
I think your invitation and advice is very good, but someone has set their investment goals before reading your writing, I myself am more interested in investing in altcoins that have slow movements, even down in price up to 60%, for example BTT, AURORA, VIDY. for now I still hold the token.