The prices tends to rise slowly but still its not too late tp buy bitcoin because we might witness another bull run before the end of this year and price cross $15-$20k so invest now before regretting buying at peak prices.
In my opinion there's no late nor early buy but aslong as you enter on correct position then it's good since Bitcoin is so volatile and we might gonna earn if we choose to hold or to sell and the only thing we need to research here is on when we enter since there's a high possibilities that we can earn more since a huge odds for bitcoins to pump and the said figure or even more.