Oracle Database Express Edition (XE)

Hi experts,

We're using 21XE and we've dropped several old backup tables with blob columns, but still get the max 12 GB error.

Using this SQL, it seems to be a lot of free space:

SELECT round(SUM(used.bytes) / 1024 / 1024 ) || ' MB' "Database Size"
     ,round(SUM(used.bytes) / 1024 / 1024 ) - round(free.p / 1024 / 1024 ) || ' MB' "Used space"
     ,round(free.p / 1024 / 1024 ) || ' MB' "Free space"
 FROM (SELECT bytes
         FROM v$datafile
       UNION ALL
       SELECT bytes
         FROM v$tempfile
       UNION ALL
       SELECT bytes
         FROM v$log) used
     ,(SELECT SUM(bytes) AS p
         FROM dba_free_space) free
GROUP BY free.p;

What can we do?
Thanks,
Jose