You meet the 6 months residency requirement for Florida jurisdiction. Therefore, you may file in Florida. You may serve her by constructive service - publication or posting.
File a petition to divorce in the county in which you reside. Florida has jurisdiction based on how long you have lived here. Of course, you would still need to have your wife in Guyana served and obtain proof of service. You can likely hire a process server that handles international service for this purpose.
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