what is the another ways to lifted up the Value of bitcoins in the market?
I think the better word is "stable" instead of "down" for it's been rising slow and steady for several months now. To answer your question, bitcoin simply needs more investors and holders. The basic law of supply and demand always comes into play. More holders mean less supply, which gives it a higher value. This could be be achieved by mass adoption and possibly regulated by the government/s.
Not only investors and holders but considering also the time to recover from its huge fall last year. Bringing investor's trust and number of users will help to make it possible in just a few months. We can't stop some declines cause we known it volatility and do expect that it will not be of straight rising trend all the times.