ISPs don't need new experiences per se. They can keep approaching the same experience with new eyes. They might spend hours playing an instrument, finding something new or fun each time. I think as long as they can get in touch with the sensory parameters of the activity (whether sports, or art, or even passive media), it'll hold their attention. Dominant Se needs action in a different way. Some might have the same level of interests in some skillset (there are a lot artisans and athletes who are ESP after all), but those who don't.. those who depend more on environment and people to get their action will probably go nutty if they lose a connection with it.
TLDR: Find a hobby.