I understand exactly what you mean about not wanting a flat look overall, and wanting some more warmth and dimension so that you don't look washed out. I have lighter hair than you but still brown and I have the same issue. I'd love to add red but it turns orange on me and I definitely have a more yellow skin tone than you with quite a sprinkling of freckles.

I think the salon idea is a good one if you can find one you trust to know about color. If you color it and you like the color but it doesn't exactly seem to suit your skin tone, you might find that altering your makeup (like your blush) might do the trick.

You make me want to try red again.
I love red hair I'm really interested to see the results - whatever you do. Please post back with a picture when you can.
2/c-3a Coarse hair med. density.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
Best 1st day method: Ice Queen!
Stylers: Mix Curls in a Bottle into everything for shine. Terrible pj
Sometimes try roller sets or use a curling brush - classic glamor.
Every day is a gift