There is still possibility to buy bitcoin at this time because yesterday the price in trading market has decreased very sharply, this is an advantage if we buy now because there is trend of increase every half day starting from now, we also must buy and follow altcoin movement because if we hope only from bitcoin movement will not bring significant profit.
well, I say wait until btc drops to below 2k before buying. even if the price is now on a slow decline, it's still around 2.5k which is, fore, still too expensive. I haven't sold my btcs with the last good pump though im expecting the next one to be better and we may reach 3k in a short period