Before you focus too much on the medium, perhaps you should work a little more on your message.
It's good to have knowledge of online marketing techniques, but what exactly is it you want to market? What kind of message do you want to spread to other people? How do you want to impact the world you live in, and the lives of others?
Where do you want to go with your life? What is it that you would do if you knew without a shadow of a doubt that you could not fail?
Your motivation does not lie in your medium, it lies in your message, your goals, your raison d'etre. Without a message, a medium has no purpose.
You can have the fastest, most tricked-out automobile in the world, but if you don't know where you want to go with it, all you'll be doing is going nowhere, really fast.
And who knows, once you have your message and your goals clearly defined, you may find that a donkey is sufficient for your purposes.