I think as of now you should buy lots of bitcoin because it still a small market value. The company of bitcoin will rise up once again before this year 2018 ends; lots of income will come.
I think selling our bitcoin now is the most stupid thing to do, because the price of bitcoin is really low and selling it with a lower price is can result a big loss for us, so for me you should buy many bitcoin now because the price now is dump to $7100.