Beautiful quilt, love the blocks and colors.
This is a tough one, can see why you don't know where to start.
First thing that caught my eye was the border. There I would stitch in the ditch around the basket blocks and around each of the baskets. In the larger setting diamonds I would do a pattern to fill them in, I see flowers in the fabric, so maybe a pretty rose motif, or feathers.
In the center of the quilt, I again would stitch in the ditch around each block and each motif, and then maybe a larger meandering around the off white background.
Hope my suggestion helps you, I'm sure there will be more to come.