Google Maps Cost

I am trying to decide if new functionality in my app will cost me more for access to my google maps API. I will still show the same map it is just the map will have a huge amount more markers. The map has a workflow for when a marker is clicked. I’ve read the maps platform pricing sheet and assocated links but do not understand how this relates to the maps and assocated map markers in my app.

If anyone can enlighten me it would be appreciated. Thanks