Riding plan

I am planning to do a long ride from Miami to New York in the spring. Thinking about doing it in May.May is a good time for it because then the temperature is not too hot in Florida and not too cold in New York.The distance is around 1500 miles. I plan to do it in 18 days. And my plan is to do a full randonneur SR series next year and hopefully a long rando ride too. My training now is I am pumping up my miles per week and my goal is 500ish miles per week. Most of the rides are short rides. But in between I do long training rides. Miami-Ft Pierce and back is a 300 mile ride and one of my favorite routes. Miami to Key West and back is fun too. In between I will ride centuries and rides with various bike clubs all around Miami.