There are over 400 different named/identified/type of cancers. what would be one reason why the demise rate has not decreased for any of them, especially kidney cancer in florida?

One reason is that many cancers are painless at their onset and only manifest themselves when symptoms occur in the late stages where the chance of successful treatment and survival are limited.

You are painting with a wide brush. Death rates from many cancers have decreased due to the availability of more and better surgical and medical treatments and early detection- in Florida and elsewhere in the country