if you do that, but if you have the coins already better to sell them due to that the price will going to dump at around 50% of the price pumping
recently. There are a lot of traders doing this method anyway for several times and I've seen this repeatedly in this field of business industry here in the cryptocurrency.
If we are doubting, we can also invest with smaller amounts. That shouldn't hurt us in case it fail. It's okay to sell as long as he bought at a cheaper rate. He can still be able to make some profit but if not then I don't think selling now is a good idea. The only thing that he will be getting is a loss if he did that.