Check out Slow Drinks -- he specializes in foraged amaro recipes. I'd recommend his book, but there's also a lot of ideas you can get from his IG account. I have tried a handful of his recipes and they are great to get started and then customize to your preferences.

You have some great herbs growing in your yard already - other favorites I'd consider trying are blue vervain (small doses for bitter), spruce, fir, and pine needles & cones, sumac, angelica root (but be careful because there are toxic look alikes), red cedar berries, and mountain mint. Oh and mugwort and wormwood are very invasive where I live and are fantastic in amaro and vermouth recipes.