A fun problem for us to look at!
Option 1. If you want honey
Take away the brood and stop the queen laying so as to maximise the foragers and reduce mouths to fees. Distribute most of brood in other hives. Put queen in one of those big traps that means she can lay only a bit, but not loads, or even put her in a nuc.
Option 2. If you want money
Make up nucs from this hive using QCs from another colony and sell them. Kill this queen. There's more money in bees than honey.
Option3. If you are not bothered about money or honey, but just love the bees and want an easy life. Requeen. At least then the same won't happen next year.
Since you are the guru and I am but a grasshopper, I am looking forward to your response.