I wouldn’t say it’s abandoned, but it’s not a high priority for me right now either.
I took a look at your site the other day, but couldn’t see any clues as to what the problem might be. The plugin still works for me on other sites.
Google did recently start requiring API key restrictions (or at least complaining when they’re not present). If that were the problem, then it should have shown an error message in the browser console, though, which I didn’t see on your site.
If you want to try it, you can add restrict your API key to the “geocoding” and “maps javascript” APIs:
https://developers.google.com/maps/api-key-best-practices#restrict_apikey
It can take up 5 minutes for the changes to take effect.
If that doesn’t work, you could try temporarily disabling all your plugins to see if that fixes it, and temporarily switch to one of the default themes.