what wrong with my rman backup

My database is Oracle Enterprise Edition 19.10 ,

My rman backup are storage in ASM RECO.

My schedule is FULL twice a week Sat and Wed, Incremental Sun, Mon, Tue, Thur, and Fri

And a Purge twice a week on Sun and Thur.

Below are my rman scripts.

My question is that after a week of running my backups I still donot have a enough to complete the end   my cycle for backups.

FULL

connect target /;

run { allocate channel d1 type=disk; backup incremental level=0 database plus archivelog delete input; release channel d1;}

exit;

Incremental

connect target /;

run { allocate channel d1 type=disk; backup incremental level=1 database plus archivelog delete input; release channel d1;}