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Rising Star
I generally use Espoma's organic fertilizers, but test your soil before adding anything. (I'm assuming you're talking about a tree in the ground, since organic fertilizers don't work that well in pots.)
Crop-specific fertilizers are mostly nonsense; nutrients like potassium and phosphorus get taken up in far smaller quantities than nitrogen, and if you apply the same fertilizer every year you will end up with way too much of those. I have soil that the previous owners kept applying "rose fertilizer" to for decades, it has accumulated nearly toxic levels of phosphorus. You need to know what's in there before you can know what to add.
My experience with citrus is limited to limes and Meyer lemons, but my understanding was that orange sweetness required warm temperatures. I'd be surprised if you can add anything to the soil to affect that, but I'll let others with experience speak to that. (Unhelpful answer: add sugar at harvest time 🙃)
Pro
You could also try grafting on another orange variety. As a CA resident, California CCPP will sell you graft-able budwood from hundreds of varieties for cheap!