Identify multiple platform relationship from creators

This is not for the court system. I am trying to identify the person's identity that is on multiple platforms with multiple names/sites ect. Twitter, Instagram, OF. Fansly, Reddit, ect ect. These accounts are not obscure unfindable searches. Each name or site has 100's pic /videos, content picked up and carried on dozens of sites. All of these posts are faceless. I'm trying to find out if they are all the same person. The content stems back 20 years but has been posted within last 4-5 years. Over such a long period its difficult to identify 100%, although my research believes they are.

More details:

Is this project for business or personal use? Personal
What is the main goal of this identity search? To resolve a personal curiosity or concern
How soon do you need your project completed? ASAP