If you are uncertain as to whether your business is a prohibited business or have questions about how these requirements apply to you, please contact Stripe.
Once Stripe has flagged your business and notifies you of the breach, you should explore other payment options. This includes using Paypal or using an external checkout.
For customers on Pro plans and above, you should review your courses pricing payment plans, ensuring that your courses no longer have price subscriptions. Paypal does not currently support a simple way to set up payment subscriptions on Thinkific.