If you want to permanently delete your Instagram account, you can follow these steps:
Log in to your Instagram account from a mobile browser or computer. You cannot delete your account from within the Instagram app.
Go to the Delete Your Account page on Instagram's website. You can find this page by clicking on the following link:
https://www.instagram.com/accounts/remove/request/permanent/.
Select a reason for deleting your account from the drop-down menu.
Re-enter your Instagram password when prompted.
Click on the "Permanently delete my account" button.
Your account will be deleted immediately, along with all your posts, comments, likes, and followers.
Please note that once you delete your Instagram account, you won't be able to reactivate it, and you won't be able to use the same username again. Additionally, Instagram may take up to 90 days to completely delete your account from its systems.
If you're not sure you want to permanently delete your account, you can also choose to temporarily disable it instead. To do this, go to your Instagram profile, click on "Edit Profile," scroll down to the bottom of the page, and click on "Temporarily disable my account."