Identifying User Activity by IP Address

Hey Community, I hope you all are doing great.

I need to know about the IP addresses of devices that have logged in and the activities those IPs performed, such as creating or modifying documents. The scenario is that there is a test user account that has unfortunately been used by several people, making it difficult to determine which person performed which activity. I have already created different IDs for all the users, but they are still using the test user ID instead of their own. I have since changed the test user password, but I would like to know if it’s possible to identify who did what. Can anyone help me with this?

Thanks!