I didn't ever buy bitcoin. But with the current price for bitcoin I really regret that I didn't buy bitcoin on last August-September when the price dropped. I doubt we will ever see such price for bitcoin ever again.
Nothing has late even now if you want to get the profit which every user got with the previous price rise then you can get by buying now as the price came down a little lower due to bulk sale of different investors but once again the price will increase when people will start once again to buy for further investment.