The last time I sold a home was in Maryland in 2011. I knew of a local realtor that charged 4.5%, so I had focused on them. I went to their website and found they had about 30 agents. I looked at each agent and most of them had 1, or 2 or maybe 3 listings except one agent had over 30 listings. I called her and listed my home that night and it sold by noon the next day. True Story.
Here is a link to Zillow and a search of the top selling and listing agents in Sumter County. Since we don't know their commission rates, I would click on each agent and look at their website and see what info is available and the listings they have. Skip the top 3, featured means they paid for their spot. Start with Robbie Shoemaker and work your way down.
https://www.zillow.com/sumter-county...%20County%20FL