I would do it using ContentArea('ID') ampscript function: https://developer.salesforce.com/docs/atlas.en-us.noversion.mc-programmatic-content.meta/mc-programmatic-content/contentarea.htm
Build 7 separate content areas, containing HTML for the hero of the email, and select each of them, based on the weekday. SET @today = Format(SystemDateToLocalDate(Now()), "dddd")
Then build IF / ELSE IF which switches between the different content areas, based on the value of @today