I guess there is only one strategy in the cryptocoin world that works in the long haul (apart from arbitrage, of course), that is, to follow big fish and not get caught in the way (unless you are the big fish indeed)...
I ever did this (follow the big fish), but what if after I following him and then he suddenly disappear? What should I do next?
Sell your stash of coins as soon as possible. You may of course ask me how you can catch this very moment (when pumping turns into dumping), but I pretty much don't know. Personally, I prefer day trading. By the way, yesterday was a good day for Dogecoin (remember, follow the big fish), and I guess many profited handsomely...
How come you ask them to sell their stash of coins but you didnt give any spesific reason? You need give them at least a reason why you should pump and dump it as soon as possible. This will help them and give them some good information when trading
Specific reason for dumping one's stockpile of coins was given in the post I replied to. You may want to read it