How to execute scripts for each user within the same time?

Hey everyone!

I have made an MVP that is a python script basically. I have deployed it on Heroku. So for a single user, it works fine. My goal now is to make a unique "copy" of this page for each user and to be able to change code and run it independently from each other. But I am struggling with finding the guide on how web app architecture should look like and what to use to execute the app uniquely for each user.

Thank you in advance!:)