First bitcoin won't fall to $1000 or $3800.
$1000 is highly unlikely, but $3800 isn't that unrealistic. We could reach $3800 and still have a higher low, and it might even be quite healthy for the market to plunge from where it is right now.
and Fomo actually makes prices go up. but Fomo might hurt you. if you want to profit, don't rush into action. You will not miss anything if you are good at doing analysis first mate
Fomo by definition is not really a good thing. It means that you either waited too long because you're too conservative, or you miscalculated the trend entirely and discard everything you initially valued just to be on board.
That being said, patience is the most important aspect of trading and investing in general. Even if you missed out initially, if the trend is up, you can still ride it up for a longer period of time and still make decent profits.