Hi @Michal_Jaraczewski I see you already posted something similar in April. I guess you did not find any solution.
If there’s still no way to filter based on the sender (not you), you could set up another scenario where you would add your post id to a database (or a G Sheet) every time you post something on your Facebook pages.
Then in this scenario here (watching new posts), you could add a filter to select only messages with ids not on that database.
Hope that makes sense 