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.