Once a subscription is active, the price can't be increased. You can remove that price point from the join page but members who are already subscribed to that membership would continue to be billed at that price.

You can always add new, more expensive price points to the join page but those would be for new sign ups. If you want to increase the price for active subscriptions, you would have to cancel their subscription and ask them to sign up again at the new price - something that is NOT recommended.

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