If it is really overvalued and the other party is the debtor, you can raise an objection to the evaluation agency and re-evaluate.
It is recommended to find an asset manager to handle it. If not, get a professional lawyer.
Your goal is to pay off all debts, but you also know that your assets are really high. See how much you have left. If not, negotiate debt-to-equity swap. If you don't agree, calculate how much you have left. If you can't, you will file for bankruptcy, and everyone will have a hard time. Instead, you should relax and start over.
I don't know your assets and the operation of your existing business. Therefore, it is recommended to consult a professional lawyer.