Instagram bot to follow accounts

I'm wondering if there is a bot that can follow a list of account I previously scraped. That is the primary task I want to do, it would be great if the bot can also unfollow accounts that didn't follow me in a given time, and then re follow again after another given time and so, and so.

This is my first time looking for something like this, I usually don't use social networks too much.

I know I could buy followers, but that does not meet my goal that is to get a very specific target of people.