How can I restructure my spa business to alleviate debt?
You will either be able to renegotiate those debt factors or you won't. You may not be able to control that; however, you can control some factors in your business to raise the cash you will need to grow our way out of your situation.
First, you'll need to cut expenses where you can. Second, you'll need to focus on getting additional business from your current and existing customer base.
One way to do this is to create a membership fee per month, or an annual paid membership broken down by month. You may also be able to go back and offer added-value services to your customer
Why this strategy and not one that goes after new customers? Because it is up to 10 times less expensive to sell to your current customer base than to get a new customer. In addition, new customers rarely become fully profitable until the second or third transaction. So you'll need to go back and "win" those old customers back . . . it will be the least expensive way to build back your cash flow.
All the best.