This said, there is an easy way out: Give btrfs more space ;-)
add a (unformatted) partition (for example a fast extern USB-Stick with 8GB) to the btrfs-volume with
root # btrfs device add /dev/[sdz4] / COPY TO CLIPBOARD
Do NOT remove this USB-StickFrom now on this partition belongs to your volume! Do not boot without it. If possible do not reboot at all in this stage! This USB-stick has to stay until btrfs device remove has completed.
look for old snapshots you don´t need, remove them now (starting with the oldest one)
or delete some files you do not need
Do this until your disk will be not more then 95% full (plus 5 GB free space)
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