Someone with 200 subscribers might have a newer channel, might not upload consistently or often enough, might not be as likeable of a personality, might not have a teaser at the beginning to hook the viewers and keep them watching, might not use end cards to keep viewers watching more afterwards, might not have properly optimized their videos as well... there are a number of factors at play that determine the success of a channel.

For your videos to be successful the main things to focus on should be watch time (getting people to watch further through your video and stay on YouTube longer after they're done it), uploading at least one video a week (even if it's just very simple videos that you can shoot a bunch of at once, to intersperse with your regular content), and optimizing the metadata so you're getting found for the keywords people are searching for (and showing up as suggested videos against other popular videos on the same topics).

Happy to have a look at your channel and then provide more custom solutions in a call!