Create & Alter Schema Permissions for a Login role in Postgresql database

I have a Postgresql database with 3 Schemas (2 user defined and 1 public).

I have script that takes backup of the user defined schema's and then drops
the schema's.

Now after doing some operations I want to restore the user defined schemas
from the schema backup(schema_backup.out).

When I execute
cat schema_backup.out | psql xx_db_name_xx

I am getting the following error message
ERROR: permission denied for database xx_db_name_xx
ERROR: schema "aaaa" does not exist
ERROR: permission denied for database xx_db_name_xx
ERROR: schema "bbbb" does not exist
ERROR: must be owner of database xx_db_name_xx

When I execute the same command as Admin user its executing just fine. But,
when I execute as a 'xxxxxx' user its failing.

Can someone guide me, what permissions/rights should be added to 'xxxxxx' to
restore the schema?

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