I think only emerging coins and relatively well-known altcoins are worthy of my investment. Because the new coin doubles in price easily. I will not pay attention to some dead altcoins, even if its price rises, I think the risk is relatively large.
Dead altcoins are not coming back, however difficult it might be a pill to swallow. Bagholders of those coins would have already exit the market and hence the rest of small cap holders will be in a loss. It is better to move on from such coins.
Newly launched coins will suffer the same fate one day which is why they need to sold at high and the trader must exit to bitcoin only portfolio.
Rest of the sudden pumps are manipulated and hence should not be touched.