There are multiple factors you need to take into account when trying to grow a channel. The quantity of uploads is one but not the only one. Most pros will tell you to upload at least 100 videos in 1 year, so basically about 2 a week. This gives Youtube a chance to evaluate your channel and determine several factors they can use to determine how to share your content to more viewers. But you also need to take into account the quality of the content. YouTube won't share a video no one wants to watch. Targeting a specific audience, what we call your ideal audience, is the best way to make quality content that can get you more views and thus eventually get shared more.