Database Software

I got above error on alert log, and try to delete obsolete backupsets, archivelogs, all not resolve the issues.

What is the best way to deal with db_recovery_area? How to free up spaces?

I tried to asmcmd to asm storage, and deleted those under FRA folder, and still shows space full. I would guess need to use rman to delete things, but now rman delete obsolete said no more to delete.

Thanks for help.