Pretty much right now. You should always try to buy at a low point or when nobody else wants it. When people get too greedy, it will be time to sell. You shouldnt focus too much on the price that you buy at because nobody can control nor predict where the market bottom is going to be.
Yeah right the price is pretty much in control to buy and hold as we see uptrend in yesterday and today also bitcoin has risen from 6800 to 8000 in these two days but i think still it is not too much to invest right now as it is just in control right now and i think it will be arround 20,000 to 30,000 at the end of this year so, right now this price is nothing in view of that for me.
As in general panic time is the best is when there is a bad news about it , that will make people sell bitcoin quickly, and we just need to wait a short time, we will be able to buy bitcoin at a very cheap price, however sounded very simple but when we fall into that situation, we will also be very easy to panic. So I think we always need the best psychological preparation to deal with this situation, a cold head, a patience and a wise decision will determine our profit, this is also the time to identify a good trader and a normal trader.