Ahrefs and Google Search Console (GSC) provide different ranking data due to their distinct methodologies. Ahrefs estimates rankings using its own database and algorithms, offering competitive insights and backlink analysis. GSC, directly from Google, provides precise ranking data specific to your site's performance on Google search results. Discrepancies arise because Ahrefs approximates based on available data, while GSC reflects actual user interactions and search engine indexing.

Having 300 backlinks but no traffic and only 5 keywords indicates that the backlinks may be of low quality or irrelevant. Focus on acquiring high-quality, relevant backlinks and improving on-page SEO to better target relevant keywords and improve visibility and traffic.