Engadget

Tap Account Center and a menu will appear showing you the singular or multiple profiles you manage and all the tools on one page. Instead of selecting “Personal details” as you would on a mobile device, tap “Your information and permissions,” which will open up three drop-down menus, one of which reads “Deactivation or deletion.” Tap and then select the profile you want to deactivate or delete, then select which action you want to proceed with.
Either way, you will be prompted to write your password for that profile if you select to deactivate or delete the account. Finally, you will need to select a reason for deleting or deactivating the account, and then you’re done. Once you select the reason, for a second time, Instagram will ask you to confirm deletion and give you a date that your account details will be permanently deleted off of the platform.
Again, after your request goes through, it can take Meta up to 30 days to delete the account and affiliated information permanently. Meta does warn that during the 30 days pass, your content will remain subject to Instagram’s privacy policy, but your information and profile will not be accessible to other people using Instagram. It also is worth noting that it can take up to 90 days for the deletion process to finish after it gets initiated. So if you're really trying to disappear, it could take a while.