Cold emails are doing quite well, but losing interest

So I've gotten quite a succesful cold email campaign going where I'm contacting creators with a custom-built preview of a website they can claim (not gonna go into a lot of detail). I'm seeing a lot of positive interest but I am having issues with getting them properly onboarded. I've created this claim flow where I just send them a follow-up email with a link where they can sign up and gain ownership of everything on my platform - and only a few of them have actually done so.

Wanted to hear your experience on situations like this. Is it just my onboarding flow that is flawed as I can see that they enter, click around a bit but haven't really gotten to the "aha" moment.

Author: Chucki_e