Struggling with geo-IP accuracy for our 'What is my City Name' tool

Hey folks,

• Context: we've got this simple web tool, "What is my City Name," our main goal for it is quick, accurate city-level identification based on a user's IP.
• The Core Problem: we're consistently hitting a wall with geo-IP accuracy, especially for mobile users and edge cases. the data just isn't granular enough or isn't frequently updated, causing real headaches for us.
• What We've Implemented/Tried:
  • started with MaxMind GeoLite2, then upgraded to their paid GeoIP2 City database for better resolution.
  • experimented with IPinfo.io and AbstractAPI for comparison and redundancy, hoping to find a more reliable source.
  • implemented client-side IP detection (via WebRTC STUN servers) as a fallback, but that's privacy-sensitive and not always reliable, plus it adds complexity.
  • caching strategies for frequent IPs to reduce API calls and improve speed, which helps performance but not core accuracy.
• Specific Issues Encountered:
  • significant discrepancies between providers for the same IP, sometimes off by hundreds of miles, which is just crazy.
  • mobile carrier IPs often resolve to major cities far from the actual user, making our tool pretty useless for those users.
  • VPN/proxy detection complicates things, but even without them, accuracy is shaky.
  • database update frequencies don't seem to keep up with dynamic IP assignments, especially with ISPs recycling IPs so often.
• Our Goal: achieve sub-10-mile accuracy for at least 80% of our traffic, or understand if this is an unrealistic expectation for geo-IP technology right now.
• Looking For Advice On:
  • are there lesser-known, highly accurate geo-IP providers specifically for city-level resolution that we might have missed?
  • advanced techniques for combining multiple geo-IP sources to create a more reliable "consensus" location? maybe some statistical methods?
  • strategies for handling mobile carrier IPs more effectively without resorting to client-side geolocation?
  • any open-source projects or algorithms that provide better geo-IP data processing or correction?
• appreciate any insights or experiences you guys can share! Help a brother out please...