Right now Google Tag Manager isn't installed on the website, you can create a new tag manager account and share admin access.
We need Google Analytics 4 data layers setup as per Google's Official documentation. Google doc with instructions given below.
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10 freelancere byder i gennemsnit $14/timen for dette job
I have extensive experience with Google Analytics, as I have implemented it for 7 of my own websites. With my prior knowledge and experience, I am confident that completing this task for you would be a simple matter.