My hair is similar to yours (although personally, I like yours better) Thinning it never worked, and although yours looks great the way it is, I understand the wanting a change thing. Due to hair boredom, I recently started getting my hair layered. It gives a different look while letting me keep my long hair. Thinning always made my hair look thicker and more poofy.
3a on top and sides/3b underneath...lots of hair

My HG: Sabino Lok & Blok