OSM is a collaborative map editing project, meaning everyone is working on the same dataset - OpenStreetMap. One cannot filter out another mapper, but users who are consistently making bad edits can get blocked or banned. In this case, members of both the Serbian and international OSM communities were questioning the validity of your changesets, considering that you are still a new user, and many of your edits up to this point have been deletions. That is why your recent changes ended up getting reverted as potential vandalism. Serbian OSM community is most active on Telegram (channel: osm_sr ), so if you'd like to reach out and meet, you are welcome to join. You can also post on the OSM community forums, though Telegram is easier for frequent or "minor" questions, and forum better reserved for topics possibly needing discussion.