Can you look at the archive logs to see if there is a large number of archived logs generated around the time that you think the schema was dropped. You are in archivelog mode aren't you? You may want to restore to a separate database and move over the data that you can recover. As Jeff said, good luck with that.
Yes, it is dropped by DDL. So, we decided to use recover till time.
The issue is that it might erase all the work happened to the other schemas from that time on.
So, is it feasible that we duplicate the current database to another database and then recover that new database using point-in-time recovery and then export the schema and import back into the original database?