You can bulk-delete generated videos in My Library. You do not need to delete your account.
Download anything you want to keep first. Video deletion cannot be undone.
Open My Library and choose Videos.
Switch to list view in a wide desktop browser window.
Clear any previous selection. Use the checkbox at the top of the table to select the eligible videos currently loaded in your filtered view, or select individual videos.
Review your selection and the selected count. Choose Delete, then confirm Yes, delete N items.
Select all does not select your entire archive. Scroll to load more videos and repeat for remaining batches. In a narrow window, the header checkbox may not appear; widen the window or use individual checkboxes.
This removes selected videos, not your account, images or audio.