I think your color would look great a dark red brown. Make sure to get a gloss to add shine at the same time as it revamps your tint. Ti care for curly hair make sure to only brush it when dry and use a large tooth comb when we. Using a deep conditioning mask a couple times a month as well as a leave in after washing will help keep it hydrated and manageable. Use a heat protectant when using any thermal irons to keep it from drying out and slightly trim the dry brittle ends every 6-8wks.

Go redhead all the way.

I see a nice copper tint to your curls. I think auburn highlights with some strawberry blond in the front would look so nice on your curls. Accentuate your curls. there are so many curl defining products out there for natural curly hair. I love the style in t his picture. I think you could wear it well.

Go light brown with a few auburn highlights.