Your colors are really pretty. Steaming and ironing sounds good to me first. If you are not entering it into competition, I doubt if anyone will notice. It will still keep someone warm and comfy and the happy colors will bring smiles. When someone tells you how beautiful it is you might even share a giggle by letting them in on a secret that it is not quilt-police-perfect.
Reminds me of a story: a few decades ago in college I was self-consciously sitting with a very attractive male and was trying to be very "perfect" and demure. I went to take a sip of my coke - missed my mouth - and poured half of the coke down the front of my shirt. This was the kindest male I think I ever met - he said "oh, don't worry about that... perfect isn't interesting " I will never forget that sweet and wise short encounter. Enjoy your quilt!