The problem likely is with your niche. I see you have one gig in proofreading and editing. The buyer requests you’re able to see are only those that have the same or similar tags as your gigs.
Many sellers post on the buyer requests page but, at least in my experience, I wouldn’t say that that constitutes the majority of the requests.
I have one writing gig but I also have many gigs in programming and design and I usually see far more buyer requests than seller requests in there. I think you should try adding more gigs with diverse tags to see more of the buyer requests