Controlling prices artificially is not a good idea, governments have been trying to do this for centuries, with terrible results. But if you mean helping the price to grow organically, the best way is to promote the benefits of Bitcoin to others, and if you're a high skilled developer, you could create features and apps for the Bitcoin ecosystem.
Actually, there is no way you can stop the crashing/bear market. The price will always keep going up or down actually, as far as the community/users increases and decreases. There is nothing to worry since, since the price keep rising everyday, and even if there is a noticeable decrease, it still picks up.
But really there is something to be done about the issue of volatility but from crashing, I guess that will be based on our collective effort to stand strong even in the face of much uncertainties and panics because these are the times that the faith or love or even commitment we have in bitcoin, is really put to test and if majority of us can stick to that, I am sure we will do well in mitigating against the crash although we might not be able to stop it, but we can really reduce the impact.