I was going to say look at the bulbs; sometime they short out on the inside and blow fuses. but you did that. I would keep looking around the dash area if that is where & when it began. These kind of things can be very frustrating.
If you can unplug all circuits to that section; and plug them in one at a time until the fuse blows; then you have a clue.

It's tight under there.

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