Archive your class and re-use your posts.
Archiving a class will remove your class from view (there is an "Archived Classes" menu option to view the classes you have chosen to archive). It will also make the class inactive so students can no longer edit assignments and share posts.
For next year, you can quickly create a new Google Classroom for your students to join, and you can re-use your old posts, even from classes you have archived.
Check out the brief video tutorial below to learn how to archive your classes and re-use your posts.