Assuming you've settled on the choice to Delete Instagram Account, whether since you've grown out of the requirement for a certain finsta or on the grounds that its parent organization Meta is pursuing debate once more, doing so isn't generally so fast or simple as it ought to be. As of not long ago, it wasn't possible from inside the Instagram application.
Feel free to pause for a minute to make a mandatory "I'm erasing Instagram" post assuming you'd like. From that point onward, you have two different ways you can go about it.