Thats what Free Flight is for. MSFS does “simulate” what people coming for small islads might have to do to advance their careers.
Do maybe two live weather missions (Cargo) and many more missions might open up for you in Bora Bora (via the 4000+ credits and 400,000+ xp you get get from flying one of those missions).
XP opens up career missions. Certifications give access to more aircraft types to fly in missions.
*** I only suggested it because your complaint is that you don’t have any available missions. If 4 to 6 hours of flying in another region of the world is game breaking for you, that is unfortunate.