Hi, thanks for posting an interesting project.
As I understood you want a simple bot which goes to account and checks if there is a pending follower request. And If there is - accept it.
I've worked on similar project before and I have a wide range of experience on working with Nodejs and instagram official and unnoficial apis.
I mentioned "bot" because Instagram doesn't have an official API to accept follower requests, That's why we need to write a bot which logs into the account and does the job like a real human.
So I'd highly recommend using Nodejs and chrome puppeteer (headless chrome) for accepting the requests.
I'm an experienced web developer working on scrappers and fully automated bots for over 5 years and I think I can complete this project in max 3 days.
Looking forward to work with you :)
Thanks.
George.