Low grade slope food?

Please point me in the direction of previous posts if this info exists here already, but I couldn’t find it!

We recently purchased an existing small-scale blueberry “farm” (quotes because it’s only 1.5 acres). The blueberry bushes are 75+ years old and thriving, but we have another 2 acres I’m hoping to maximize for food production, both for our family and for small farm stand. We’re in zone 5b in Massachusetts.

We have some flat acreage, but most of that is already occupied by blueberries. The rest is between a 5-45 (most between 5-20) degree slope. I’m looking for ideas, experience, plans, or resources for food ideally suited to these slopes! Chickens and ducks are in the plan, but we have other less arable land I’m hoping to put them on. Bees, too.

Open to everything from Christmas trees to fruit trees to herbs to… whatever! Just has to be edible (exception Christmas trees and maybe lavender/other desirable ornamentals). Ideally we won’t need to terrace, but feel free to tell me I can’t get away without terracing.

I’ve read a lot of the classic permaculture books recently, but so far haven’t come across anything that specifically deals with slope.

Grateful for any and all suggestions!