As what i have seen on the coinmarketcap.com for the market price for bitcoin that literally goes down to 6K usd is a good time to start the investment. I am waiting for this moment but still i need more money to invest on it. Well i hope i could get more money the following day so that i could invest in this time where bitcoin market price falls down.
I think we all wish that we had more money to invest in the market but I have already invested everything that I can afford to lose and I'm sure that is the case for many users in the forum, but that is fine if the amount of money that you have invested in bitcoin is significant then in a few years I'll not be surprised if you got three times to five times your investment.