Yes we can really help to stop the bitcoin price from falling if people will stop selling and start buying more bitcoin. But we can't force them to do so because they have their own thinking about it. And there are some people take the opportunity to buy some bitcoin when the price go dip thus the price will increase, and upon seeing the price increase they will immediately sell their bitcoin to earn some profit that's why the price will start to fall again, so it can really depends on us if the price will go up or down.