You're a nobody: no successes, no remarkable past career, not an expert in anything, no connections.
What value can you offer and how can you build an audience?
Worth noting, and as some motivation, you don't build an audience when you have those things. You have those things because you've built an audience. Don't fret when you see people with large audiences, that can be demotivating. Focus initially on doing something distinctive, interesting, remarkable and share that with people who will be interested in it. If it's genuinely interesting, it will gather it's own momentum the more you share it.
i like this way of framing it "you don't build an audience when you have those things. You have those things because you've built an audience"