I've never done any landscape photography, so keep that in mind with this feedback. I'm just throwing out ideas, no experience of how much they would help or if there are better things.
The main problem is that the sun is kind of washing everything out. The left side is hella bright, the right is hella dark
I would have tried underexposing a bit, maybe with exposure comp, maybe with spot metering off the tree.
Maybe a little fill flash
A graduated ND filter might help too, but if you didn't have one at the time, then you just didn't have one.