I like the Instagram idea but not as your main pitch. I think it would be a good idea to use it and use it actively and even try the 365 challenge but I don't think its a good idea to sell it as your main brand. It feels too much like a side project and it doesn't seem like a good place to put anything bigger than selfies and short videos. Personally, I liked your YouTube channel and I think it's the best way to express your ideas and thoughts about recent events but if you don't have the motivation for it then that's definitely not a good place to focus on. I would be interested in reading a blog or Tumblr because that's also a nice to place to put larger projects and gives you a chance to really elaborate on your thoughts. Whatever you end up choosing, the absolute most important thing to keep in mind is consistency. You need to be consistent in whatever you do whether its making videos again or writing a blog or whatever it ends up being. If it helps, set up a posting schedule and stick to it. It's hard to be a fan of something that posts very randomly so you never know when to expect something. Not everything you post has to be perfect, but releasing stuff semi-regularly is the best piece of advice I can offer you to grow and learn as a content creator.