Now this is the best time to buy bitcoin more.Because the price of bitcoin is low.I think not wait for 5500 or 6000.If price is high then you can not buy more bitcoin.So you should buy more bitcoin now.
Investors wish to get it on lowest price but no on want to see the price at its lowest stage because after investment they will also wish for the price to go high. So the best time to invest in Bitcoin should below 10k US dollar which will benefit you after the price start its up trend and cross the 10k figure. No one knows how much the highest value will be in future but all in benefit is to invest right now.