Make it so cartels are easy to return to. The reason people fight arms and peninsula is because they can spawn in donor and regear easily and then be off to push the cartel. With Castle drug, North wongs, Salt flats oil, and Ghost Hotel (somewhat fought since rodo exists) no one wants to go defend it most of the time because by the time they are geared and ready to go, the other people are already almost done capping. Just saying this from what I have noticed in my time playing.