I accidentally became the 'AI guy' at my company after one successful project. Now I'm in over my head. How do you deal with being pigeonholed into a role you're not fully prepared for?

I implemented a small machine learning solution, and suddenly I'm leading our AI strategy. The problem? I'm barely one step ahead of everyone else. Has anyone else become a reluctant 'expert' in something at work? How do you manage expectations and imposter syndrome?