It is gonna take a long time. We had a contributor (lodde1949) who drew pretty much all (!) the landuse of Flanders over the course of several years. We suspect he was an older person who did this like 8 days an hour, until he suddenly stopped. In any case, they never responded to our messages, so we have no idea who this person actually is (or was).
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org/.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community/
https://mapcomplete.org/ is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
When I see how much of Texas hasn't been mapped, I feel like it is going to be a very long time away. I do like to spend most of my time focusing on rural areas though since they seem to get neglected.