I think no one can plan the price of bitcoin in the future, because the bitcoin currency is unpredictable, I think now is also the right time to make profits in bitcoin, because now the price is still cheap, and the growth in the price of bitcoin is also starting to increase.
What you are telling is true, bitcoin has bottomed out and it can take some time but will go up , so it is a good time to start accumulating it slowly so that if their is price increasing your should be in profit soon.
As said it is the time to accumulate, if the plan is to invest $1000 then use $500 on the present market and further if the market declines use the remaining $500. This won't affect the portfolio value even if the price of bitcoin fluctuates downwards or upwards in large scale.