One more thing I would like to add to the already awesome advice before mine. Don't ever compare yourself to other channels. Always take into account that what you do and what other channels do are not gonna be the same even if it's in the same niche. The way you create content, the editing, the content itself, whether you have a voice-over or yourself in the video or neither, it all creates unique content that some viewers may be interested in over others. Basically, their growth may not be at all the same as yours would be. Not to mention that they might have more experience, more videos, and perhaps a better understanding of how YouTube works for them.
So don't look to other channels to rank yours. Just keep working on your channel and content and if you can find your audience your channel will grow.