In my gardens some of the perennials that have a nice scent are Mother of Thyme, lavender, crab apple tree blossoms (right now in full bloom with hundreds of bees in them), grape hycinths, iris, jonquils, tulips, oriental lilies, peonies, lily of the valley, Royal Standard hosta, lilacs, and I'm sure I'm forgetting some.

It is Filipendula vulgaris. The flowering stems are relatively tall.

When I moved back to where I grew up I knew the soil was acid based on my parents' garden notes over 40+ years. I also knew I had an entire acre of land on which to plant. I designed the garden beds I envisioned and proceeded to plant them with things I either purchased or winter sowed. My own + my neighbors' garden beds now display many perennials I grew from seed via winter sowing. If you've got evergreens, the soil is acidic--they like that. I suggest you Google perennials that prefer acid soil--there are dozens of them, including many grasses and other types of perennials. I designed my garden beds primarily to sustain pollinators (my near neighbor is a beekeeper). He and his beehives are amazing and I'm grateful to have him as a near neighbor. My primary objective was curb appeal so I focused mainly on the front garden beds. I achieved my goal back a few years ago and am pleased with what I accomplished. I have lots of photos of my garden beds but since Houzz took over I don't know how to post them.

Perhaps a type of Campanula.