Your page size is not the product
Brands buy UGC because they want the file for their ads. Followers help as proof you understand a niche. They are not required the way a sponsorship requires an audience. A portfolio of ten clean videos matters more than a follower count.
Quote a fee for the video, a fee if they run it as an ad, and a limit on revisions. "Unlimited edits" is how a $200 job becomes a week of unpaid work.