Failure Of Backup Due To Limit Exceeded For Recovery Files Since Cannot Reclaim Disk Space [RMAN-03009,ORA-19809,ORA-19804]
The db_recovery_file_dest includes a variety of files, including online AND archived redo log files; take a look at the Oracle Backup and Recovery User's Guide chapter 5 to find out the best solution; disabling db_recovery_file_dest is not a good idea.  You can try 

RMAN&gt; report obsolete;


RMAN command to see what can be deleted. Then do a delete obsolete to delete them. Do you have any guaranteed restore points defined? 

RMAN&gt; list restore point all;


If you see any results with type GUARANTEED, if they are no longer needed, remove them:

SQL&gt; DROP RESTORE POINT before_app_upgrade;


Is flashback database enabled?