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btrfs fi usage /
btrfs balance start -dusage=5 /
btrfs fi usage /

Do that and then report the complete results (both usage outputs and the balance including any error). This should recover allocated chunks with data profile, that aren't actually being used to store data, back into unallocated space. If you get a failure with a value of 5, try a lower value, including 0 if necessary.