just wait till it drops more and once you found out that bitcoin is going bubble again you can invest early ASAP and then buy bitcoin as much as you can in that case you can make a good profit on it. trading works that way so definitely all traders starting to gather and planning when to buy bitcoin and that demand will gonna cause bitcoin price to rise again.
If you are going to buy bitcoin make sure that it's price dunp for you to earn in time, because as much as you buy bitcoin for a cheap price you could earn more when it price or its value pump by the increase of your support and the movement of its stock in the market. So make sure that whenever you will buy bitcoin it much better if you are going to set target price and starting price for you to know if you are going to earn or to have profit in every transaction you would do in the future.