I suggest you buy btc and be courageous in hoiding your coin for some time before selling.
You have to understand that buying low because the price has dropped, has disadvantages too.if you buy bitcoin simply because the price is 7000$, there is that possibilities for a drop further or rise higher. Price are unpredictable and in this situations, i think you should buy bitcoin whenever you are ready do start your investment and not because there is rise or fall in price of bitcoin.