I cant see any whonix template

yes

It says 2.48mb is free but actually its all free

I’d prioritize this - if it works then you don’t have to reinstall.

There is an option that you can check to remove the old partitions on the disk:

Free up space by removing or shrinking existing partitions


Whats next

Looks like you can follow the guide again from there, and it should get your templates installed.