Newbie question: How to improve geolocation accuracy for country detection?

Hi everyone!

I just launched my first web tool, "What is My Country? - Find Your Current Country & IP Location," and I'm really excited about it. However, I'm a complete newbie to this space and I've run into a challenge.

My tool aims to accurately detect a user's country and IP based on their connection. The problem I'm facing is that I'm noticing some users, particularly those on mobile or potentially using VPNs/proxies, are reporting incorrect country detections. I really need to significantly improve the geolocation accuracy of my service.

For instance, here's a simulated scenario that illustrates the issue:

// Fake Console Output
User IP: 203.0.113.45
Detected Country: Canada
Expected Country (User Report): United States
Accuracy Issue: Mismatch

What are the most effective strategies, IP geolocation APIs, or databases (free/paid) that you'd recommend for a beginner like me to enhance IP geolocation accuracy for country detection? Any advice or shared experiences would be incredibly helpful! Anyone faced this before?