Kaylan,
As a wholesaler, identifying which parcels have value and what developers/investors are willing to pay for them is going to require a deep dive into your market. Afterall, the value in a wholesaler is their expertise in identifying good deals and determining how much they're worth to an end buyer.
That said, some useful advice would be to identify a sub-market within the Tampa market that you can see developers are targeting. I'd do this either by calling known developers in the area or research recently sold vacant land in a particular area and see what LLC/Corps are consistently buying parcels, then try contacting them (might need an agent to help you get access to sale data). Once you identify an area with reliable development (and now have a potential buyers list of developers) you can start digging deeper and looking at what parcels are selling for more and why (zoning, water access, lot size, etc). It may also be worth calling some of the developers you've found and seeing what parcels they're looking for and whether they work with wholesalers, as some do not.
Hope this helps and feel free to reach out with questions!