How to dominate in Facebook Search?

Good day, I am a little bit new to this and I have example
a Facebook Service for Keyword . Dentist Cityname

I notice when logging through different fb accs… sometimes my page is on top, on different fb accounts not showing in the top 3 at all… Same as I created multiple groups with “keywords city”

And filled it up with bought fb group joiners…

Hope someone can help me understand the Facebook search algorithm? so I can be always on top when they search for the term example Dentist Cityname

Also By the way I renamed the Page to Dentist Cityname to rank higher but still no luck…