I will sell immediately! Because I know after a massive pump there will have a dump too. So, If I sale to pick the high time, I can buy at low again and that will be a huge profit. The market condition is not enough good to hold high when you see 200% up!
Selling fast is not exit for the smart trader, the smart trader buys again for a lower price and this is the win-win case. Buying low and selling high is the best speculative trading strategy. If the coin price increases 200% in a single day, I will go to sell 50% of my holdings. The dump is not mattered here, the matter is to get a fast profit while other traders rush to buy more on the higher prices.
In order not to miss the next trading opportunity I also advise to sell the remaining balance of the tokens for buying from the dumped prices. The liquid order book is also necessary for making a proper amount form these trades. If the pump is over and I am late to the sell the tokens, I will not touch my holdings for a saving my trades from unnecessary volatility caused by the pump-dump trades.