It’s A Pretty Piece!
Couple/few things that caught me were.
* The Piano and the Cello are you major issue. Piano (I like how it feels, kind of moody but) could brighten just a hair around 1.5k to 3k. being careful not to get “brittle”
* The Cello is “floating around” by either panning effect, or the “throw” of the reverb. Cello’s don’t float.
*There is “to me” a Lower-Mids “Tubby” thing going. You’ll get a lot more clarity rolling out some of those.
* Possibly positioning the Cello slightly right (because it comes in first) and the lower-mid woodwinds (that get introduced later) slightly left. will give you the separation you need to clear that “center isle” a bit and let the piano and melody line come thru.