For my full rational, see the original post, but the bullet points were that the colors were original and worth keeping and that the seal was bad, so I replaced it with a shield with the Swedish flag, because Delaware was formerly a Swedish colony.
The first thing I need to change is that replacing a seal with a shield may have simplified the design, but it doesn't make for better aesthetics. The second is the fairly poor contrast between the Swedish blue and the Delawarian (?) blue. Not a great combo.
Two things remain important to this design and which I will attempt to maintain; the colors of the original flag, which are supposedly taken from the colors of George's Washington's uniform, and the Swedish connection, which I feel deserves to stay, at the very least because it makes a state, which is only really famous for being first, stand out in the crowd.
I decided to try a defaced design, enlarging the Swedish part of the flag but eliminating things like the unnecessary shield. Here was my first attempt:
This one, in my opinion, is better than my first suggestion. It has a new background, the buff color shared only with New Jersey, but they're neighbors and it feels like this flag is also saying the importance of Sweden is greater than that of the state. In case that was confusing, here is the flag I settled on and which I present as my Fix of my Delaware Fix:
This time Sweden is in the background, supporting but otherwise very different from the state Delaware has become. This flag says something like "We have Sweden in our history, but now we're writing our own history" but hopefully less sappy. The buff, yellow, and Swedish blue have a nice contrast here and contain a color and design element of the old flag with updates highlighting their unique heritage. I also altered the Swedish background, choosing not to make the yellow vertical stripe off-center as it is in the actual flag of Sweden.
I also tried both these designs using the Delaware blue instead of the buff, but increasing the space given to both blues did not an attractive flag make.
Thanks to Voron X for the suggestions.