WayfindMaps
It sounds like you still enjoy the subject matter and it sounds like you know a lot more about this than the average developer. I've considered a senior developer and I've never done what you were describing.
I've suffered from impostor syndrome in the past - and I still do to an extent - but I've never found another hobbyist to be hostile about my knowledge or lack thereof.
Here are some example pages:
This is a high quality map of 'Cool Springs' https://www.wayfindmaps.com/aptpage/5e963dcec120e83050f3eb35
This complex gave us a map, but it's of questionable quality https://www.wayfindmaps.com/aptpage/5e963dcec120e83050f3eb3e
Here's an example of a complex that doesn't have map data yet: https://www.wayfindmaps.com/aptpage/5e963dcec120e83050f3ec36
Our strategy for map collection is to reach out to apartment complexes directly, and to take map submissions from users. We would very much like your feedback.