I think you should keep it because every girl should have one red bag in her closet, and with the constant price increases and the looming double flap on Jumos/Maxis, you may not find a red Jumbo in the future that peaks your fancy.
That said, if it's too bright of a red for you, maybe it'd be a good idea to sell it and another/darker red or another color that you think you will use more. I love red and I love almost all shades of red, but my favorite is a blood-red. So for me personally, although I do love the 10C red and I think it's beautiful, 09C red is the perfect shade of red for me. I don't carry mine(09C red cav Jumbo)nearly as much as my black cav
Jumbo because black is more understated and because my work environment is VERY conservative, but I carry her on weekends and I don't think I can bear to part with it. A perfect shade of red is very hard to come by!!!
A perfect shade of red(for you) can be treated as a neutral, a substitute for black and it takes you a long way.
So I think it's a matter of finding the perfect shade of red or a color(if you find that red is not your thing) for you...Either case, I suggest you hold onto it UNTIL you see something you love and you think you can substitute for the 10C red. If you let it go before you find a sub, you might regret it deeply later!
GL!