Your idea is not great because you label it “great”.
It will be great when other people adopt it and will deem it great.
Your idea becomes great because people welcome it in their minds like they welcome a new friend in their home.
Making an idea great is a collective process that you don’t control alone.
People have the lead on the popularity of your idea. So if many of them adopt and follow it, it’s more likely to be called “great”.
Therefore, the real thought leaders are the thought followers.