Savings for Existing Customers?

I can no longer afford to keep paying $300+ a month for services and channels I don’t need, want, or use. I would like to know if there are any low cost options for existing customers. It seems that only new customers are offered a fair price on a bundle or promotion and not the loyal customers who have been with Comcast/Xfinity for more than 20 years. I would like to see about getting or new plan or downgrading my services. Thank you.