OP, its true that there were many altcoins what ended up after end of bull run and no possibility to recovery or bounce back. But not all altcoins are going to dead. It seems you are inactive but if you somehow connected with crypto industry, then you can see how wrong you were. Although it was fair when a newbie have such doubt about altcoins but altcoins you mentioned, had potential enough. And that's why they raise up a lot from that position. So don't just to quickly. You need to have patient if you wanna make profit from Crypto industry.
Cryptocurrency is mainly for those category of investors that understands the market and we should be ready our chances for streak winnings. Altcoins will always end up not delivering good jobs for us because the system have been rough handled by the high presence of volatility in the system. We just have to be stable and consider our movement in the market as lowkey. I'm quite aware of the up and down movement but it's no excuse for us not to engaged in investment.