Today I found out that it’s actually a lot easier to contribute to Open Street Map than I thought. There are some serious gaps in house addresses in my area and I was painstakingly using the built in browser editor in the browser.
But, you can use a FOSS app (available on fdroid) called StreetComplete that makes it a lot easier to help out filling in the gaps in your local map data.
It’s really fun - kind of like Pokémon Go but you are actually making an impact 😁
I have a similar problem. Two entrances to my building got their numbers reversed.
If anybody knows if the app can fix it, i’l get it and make an account.
It should be possible using the address overlay in the app. Otherwise you could leave a note or use the web based editor on the OSM homepage.