Plenty of people have bought what they thought was the dip, only to watch an instrument go to almost zero and never recover. Look at Bed Bath and Beyond. It’s not quite that simple.
If you buy junk with all of your money, that's on you. I mentioned gold and (broad) index funds, although a few select cryptocurrencies also work. Buying junk must be restricted to a very small amounts only, to what one is willing to risk.