The fate of bitcoin has actually not been defined, which has brought people to doubt the digital currency on whether to invest in it or not. Asking people not to doubt bitcoin investment, will not really give any form of assurance to believe in it, most especially now that the market is down.
Remember what the legendary investor Warren Buffet said about this kind of situations?. About being greedy when others are afraid and being afraid when others are being greedy. I believe the power of those words is being extremely underestimated everyday, even when a few amount of people must be making great money using it.
The thing about Bitcoin is that you are not only making money, directly or indirectly you are being investor - A Pioneer of a better society. A lot of people have yet to see the greatness Bitcoin and Blockchain will bring in the future, but precisely the people who can see those kind of things are called Visionaries in this world.
This is an investment not only for profit. But for a better future.