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Generally if your chain breaks it was super worn out. The cassette is probably toast too. The quick link is now the only “new” component of the drive train and won’t work smoothly with the old stuff.
Replace the worn out stuff. Take a look at the chainrings just in case. They usually last through several chains and cassettes but wear out eventually.
That’s a lot of mileage. I’m surprised it lasted that long! Chains are consumables just like brake pads, tires, and tubes. :)