Optimizing Webinar Attendee Management with Clay and Google Sheets

Hi guys, I’m having the following usecase : I’m hosting some webinars 2x a month, with 1000 participants each time (through a tool called Webikeo) I want to get those attendees on Clay and score them by :

Now I’m using Make to push those attendees in a Google Sheets and then push them to Clay. My issue is that Clay is limited to 50k rows in a table, so I can’t have a “trash” table where I put all my attendees directly from Make. And from Make, I can’t also “update” my leads. What’s the best way to do that without so many steps and technical issues ?.