If you are developer and can write code and define new algorithm, you can help to growth of BTC
There are many ways that we can help bitcoin grow. Some of this are people need to invest more into bitcoin. As we can see, the problem of bitcoin is there is so much demand but the supply of this is shortage. So thats why bitcoin is still growing bcause many people keeps on investing in here. It also really need trust on how bitcoin really works, it really need trust on how we trust ourselves. All we must need to do is to give all our effort, give all our best in here.
Publicity and advertisement can help Bitcoin. By using social media we can attract more investors. Positive feedbacks from Bitcoiners can promote Bitcoin to people who didn't know it. The more people who trust Bitcoin that means many would invest. Bitcoin will grow.