I’m thinking of using a floor jack to jack up my 2-10’ gates and use truss gusset plates and 12 common stubby nails and a palm nailer to get these gates back to level with the fence, I had the 1987 Home Depot fence replaced with a hand made Yella Wood fence in 2015 with 4”x6” gate posts in cement but the framing of the gates are sagging so thinking my idea will fix the issue unless someone has a better idea?