i have 8 family members with phones
Is their any other apps or anything that we can all share and be together on. A private platform. Not part of any social media or anything
Share what? If you mean apps and media purchases, Family Sharing is the only thing Apple offers and that is limited to 6 accounts total.
Some of these services may provide what you want:
Use Group FaceTime on your iPhone or iPad - Apple Support
Group FaceTime makes it easy to chat with multiple people at the same time. You can start a Group FaceTime from the FaceTime app or from a group conversation in the Messages app—and you can add up to 32 people.
Listen to music together in FaceTime on your iPhone or iPad - Apple Support
Share your screen in FaceTime on your iPhone or iPad - Apple Support