Not only the alt coins you mentioned have dropped. Currently we experiencing a full bear market and almost all alts are down.
Fact is that nobody knows for sure if alts will recover, when they will recover, wich ones will recover, etc.
Personally I don't think all the alts will recover to old ATH's. Only the decent ones will.
A lot of wothless projects where created and hyped during last bull market.
TRON and ADA in my opinion are examples of decent alts that will recover and reach new ATH's.
Just my 2 cents on this subject.
I believe that some of those alts will recover their price once bitcoin and other major cryptocurrencies start to go up again.
But, not all. And in my opinion, those alts that have the chance to recover are those who have real applications in the market and good progress with their developments.
Those pump and dump ones will be left behind. Unless, the team has enough money to do the pump and dump scheme again.
But, we don't know for sure when will that happen. You really need patience in this market, else, you will lose a lot of your investments.