[Am I allowed to message other fiverr sellers promoting my gig to them?]

I have a gig where I make Gig Thumbnails for other fiverr sellers. Seeing as this is mainly targeting fiverr sellers, and not buyers, I think the best way to get business is find gigs with unappealing gig images and send the sellers a quick message about my gig. Sorta like being a door-to-door salesman. I'm wondering if this is against the terms of service.