At this time, Steemit has no real competition. If it did, I think you'd see more people leaving the platform. I have eye on Narrative. It has potential in terms of being a real blockchain-based social media site that the average person can use, but we'll have to wait until implementation to find out. One thing Narrative does that Steemit does not is incentivize users promoting the platform. On Steemit, users had to figure that out for themselves.