Google announced that starting in July 2022, schools and universities, such as Parkway School District, will pay for storage. You can sort your files descending by size in the Drive Storage quota and delete your largest unnecessary files. In Google Drive, select Storage and reorder to find and delete your largest files. Purging unnecessary videos or large files can help free up storage space. You can also delete previously taught Schoology or Google Classroom shared course folders in your Google Drive.
For more Google Drive tips, check out the blog posts: Create an ARCHIVE folder in Google Drive and Google Drive folder tips.