If an altcoin is being dumped, it usually ends up at 1 satoshi with no chance of revival. Some don't even survive their ICO and get dumped right at the start. You can see many of such failed shitcoins at altcoin exchanges until they eventually get abandoned, delisted, and soon completely forgotten. At first, i bought altcoins which were in high price expecting price to rise more, but sold in panic when the price started to fall