Learning how to increase your YouTube subscribers is like learning anything else - commit to learning and then implement. There are no doubt plenty of ways to increase your YouTube subscribers, but some ways will work better for different niches. Depending on the niche you are attempting to target, you may have to try a combination of several things, however don't try to do too many strategies all at once.
But if you're not shy behind the camera, then you should consider purchasing a high quality camcorder, and record yourself giving out some helpful information related to the product that you're trying to sell. Now one thing that you don't want to do is try to "game" YouTube. You will get caught. And when you do get caught, your account will get banned.
To improve your visibility, you need to make and share high-quality photos and videos in your feeds. Where necessary, seek professional assistance or advice from a photographer. However, you can use a great camera to take sharp pictures. Try to get your images at best angles. Edit your photos for better results. Nowadays mobile phones are equipped with photo editing tools for this purpose. Instagram too has several photo editing tools. Apply this tools for your Instagram marketing purpose.
Another way to increase YouTube views is to produce video that's complementary to your own blog posts. This diverts traffic from your blog to your YouTube channel.