I see more and more people are starting to doubt Bitcoin because the price doesn't go up in this new year. Honestly, I am always optimistic and continue to wait for the increase even I know that the price increase cannot be timed. So what and what should I do now?
Depends on why you got involved in bitcoin to begin with, if it is riches you seek (as most people do) keep an eye on developments, try to ignore the FUD (unless there is actual data to backup a claim) and hold on for the next 4 years or so.
Don't invest more than you are willing to lose and remember to take profit on the way up in increments so regardless of what happens, you made out well on your investment.
If it is the tech which interests you, there is a lot of cool reading and second layer solutions happening which you may find useful.