best way to improve geolocation accuracy for my web tool?

hey everyone, i just launched my 'What is My Location?' web tool, it helps users find their current coordinates and map location. we've been getting some feedback about inconsistent geolocation accuracy, especially for desktop users, which is a bit of a headache. right now, we're using the standard browser geolocation API, and for fallbacks, a basic ip address lookup service. the browser API is awesome when folks grant permissions, but sometimes they don't, or it's just not super precise on desktops. the ip address lookup is often only city-level, and sometimes it's even wrong if someone's on a VPN or a corporate network, which isn't ideal for a tool that's supposed to pinpoint location.

i'm really wondering how to get better, more granular location data without being overly invasive or needing app installs. what are the best practices or alternative methods to really improve the client-side geolocation accuracy for a web tool like ours? are there any specific javascript libraries, APIs, or techniques beyond the standard browser API that give more precise results, maybe by leveraging Wi-Fi signals or other network data, if that's even possible from a web browser? also, any tips on how to deal with users who decline location permissions but still need a somewhat accurate starting point? really keen to hear from anyone who's tackled this before, waiting for an expert reply.