If you have any alts which you didn't sell in last high, now it is better wait for rising Bitcoin till $ 7700 - 7800 and sell them there. But the price may not overcome the resistance at the level of 7000. Then it will be necessary to sell all the altcoins, as the Bitcoin price may drop to 4500.
I disagree with the drop of $4500, I'm seeing the bottom at around $5800 though. But it looks like there's strong support at $6500 right now because the price is just trading around that price for the last couple of days. So I think that best time to buy is during the $6K range. But at the current rate, I'm still think that you can buy in small portion and then waited it out and see if the price could go deeper.
If the price didn't go to let say the $6K-$6200 range then at least you have still got it where the price is also at a discount. You really need to be very intelligent right now because the price keeps fluctuating in just a matter of hours. But the main point is that the price is still cheap and you don't need to have that kind of second thoughts whether to invest or not.