If you have made 800% profit, you should sell. Perhaps not all of it, but at least sell 1/8th so that you have got your money back, then whatever happens with the remaining 7/8ths is all profit.
The coin may simply be on a long pump and about to get dumped, so it makes sense to get a little something back and gamble on the excess.
That was my initial thought... I am thinking hard :-)