https://www.themodernantiquarian.com/site/3485/moel_drygarn.html Immediately comes to mind for sheer size and just how the stone of this area was so easy to quarry.
And if you want a long walk in this part of Carn Meini there is this. Only one photo by Gladman....
https://www.themodernantiquarian.com/site/3920/carn_alw.html
Further on there is the Gors Fawr stone circle
https://www.themodernantiquarian.com/site/114/gors_fawr.html
Then of course the most famous Pentre Ifan,
https://www.themodernantiquarian.com/site/117/pentre_ifan.html
In fact there is so much to see and I think you have seen some of the other cromlechs in this area. You need a year to see everything.
Not forgetting the walk down from St.Davids to St.Non's chapel.
And then St.David's Head, or St.Elvis cromlech outside St.Davids
https://www.themodernantiquarian.com/site/3557/st_davids_head.html