I mean , i really want to invest in this , but the price is too much high, do they go down? In what month?
Not going to lie, this is a fairly poor statement to try and read.
No-one has any idea when Bitcoin will fall in price, and if you think it is going to drop below $250 USD you are most likely mistaken at this point. We have seen a price wall at $250 that kept Bitcoin afloat during the summer, and it is likely that the price wall will evaporate.
In the mean time I recommend that you look into ways of earning more money or you start working for Bitcoin online, so you'll at least have some.