So as a product manager would it be part of your job to predict these phases ahead of time? Can you introduce an improvement to the product or iterate it to forestall a decline or maintain growth.? Or are these phases in a products life cycle inevitable no matter what you do?

The products within Instagram include the following

Instagram ads

Instagram TV IGTV

Instagram for business

Instagram collections

Direct messaging

Stories

Chat

The share, like, comment, tag buttons

The search page feed and it's ranking algorithm

The search algorithm

Home page feed and it's ranking algorithm