Hello dear,hope you are well. Your videos are amazing and helpful but your channel is not perfectly SEO. So, due to lack of SEO your videos don't reach to target audience and don't rank on RU-vid. That's why your Videos do not get much audience,views, likes and comments which limits your channel growth. Without SEO any channel don't grow organically. so you should SEO your videos. Hope you have understood what I said. Have a nice day. Thanks