While many will say you don’t need a map or a compass on the AT, I always bring both. I like to know what’s to my left and right (in terms of terrain, side trails, water points, etc.) rather than just what’s in front or behind.
Rather than one long length of para cord, I like to bring several smaller lengths for multiple uses. I still have a 30-ft length to hang a bear bag.
Most evenings before dark, I’ll hang a clothesline to dry or even just air out my gear. Tents, sleeping bags, and clothing always function best when dry.