New maps with OpenStreetMap data from September 13 are now out. Press "check for updates" in the app to see them in the app!
Same for me, last time this was posted someome shared the street complete app which made it really easy to get started. (The website also turned out to be quite easy) https://f-droid.org/packages/de.westnordost.streetcomplete Really satisfying to see your own contribution