Call dynamic data into head script

Hi everyone,

I’m trying to send user data to our email platform,

I’m super new to this. I assumed I could put it into the header tag so it would track users across the entire site, but I couldn’t figure out how to identify my users in a way that sends it to

However, I was able to pull data through by adding the script to the Page HTML Header, but it only tracks the user on THAT page. If they leave that page, they are listed in my email platform as an anonymous user.

Screen Shot 2021-06-28 at 12.29.47 PM

Can someone point me in the right direction?