My understanding is that a recent switch in back end provider costs is the reason why the credit cost of generating images changed so significantly. This has clearly caused enough dissatisfaction amongst users to cause people to cancel their subscriptions as the cost of any credit subscription package was made more expensive to the point of rendering the service unusable. Please consider finding and changing to a different, more economical back end provider as it doesn't seem as though other generation tools on the market have imposed similar cost changes on using certain models.