I stopped using a smart phone a year ago. I don't miss it. That helped. Steps 1. Remember your password. 2. Log in, download, compress and archive your media and posts. 3. Delete your account. Bear in mind, there's no such thing as 'completely delete' there are multiple copies stored by the various walled-gardens, and of course by our government in a gigantic datacenter in Utah. But at least you won't be as much of a commodity.

NSA has already a copy you cannot delete.