Aspiring online business owners can overcome the fear of "not being an expert" by focusing on providing value and being transparent about their journey. They can showcase their expertise by sharing their knowledge, experiences, and insights through blog posts, videos, podcasts, or social media content. Building a personal brand and establishing themselves as a thought leader in their niche can help in gaining credibility with the audience. Engaging with the audience, responding to their queries, and soliciting feedback can also build trust and credibility. Collaborating with influencers or experts in the field can further enhance credibility. It's essential to remember that expertise is developed over time, and being authentic and genuine in interactions with the audience can go a long way in building trust and credibility.