When I see the current market situation I feel that it is actually not really a good time to buy because we already reach lowest point in recent bitcoin price fall period. But I think it still okay to buy because we still can expect profit as long as we hold for long term, maybe for around 2 or 3 months. And I am sure that it is not the right time to sell because maybe we will face a bullish market trend again soon. So in my opinion it is just a correct time to hold. I already bought bitcoin and some cryptocurrencies when it's price almost reach lowest level so I actually have good position right now, if I sell now then I can get small profit but I will not do it. I will wait.
It is 100% definitely not the right time to sell. Nobody could know how much it could drop, maybe if you buy right now we may never see this price again, maybe it will go up so much that we may never drop a single dollar under this price, or maybe it is going to drop so much more, who knows maybe drop as much as 10k or 20k and that would be the best time to buy bitcoin.
However, selling is different, selling means that you know it will drop, there is no "maybe" about it, after you sell your coins that's final, unless it drops then you will be in a loss. This is why I would assume that if we already "know" that it will go up, and only "assume" it may drop, then we should act according to what we know and not what we assume.