A few days ago, OpenStreetMap hit 180 million changesets with this one: https://www.openstreetmap.org/changeset/180000000
Great milestone, but even better to see that it's a contribution linked to the Humanitarian OpenStreetMap Team ("HOT"), by a new but prolific contributor adding lots of data in #Uganda.
Never too late to get started with filling the gaps and updating existing data on OSM, you could start with this tutorial: https://learnosm.org/en/beginner/start-osm/
