There is accounting and business procedure to write off Accounts Receivable; but there is NO such procedure to so called "write off" Accounts Payable.
You need these numbers. First, you could have already taken the expenses and created business expenses and loss. You cannot "write them off". Also, if they disappear from your book record, if any of the vendors sends you a debt forgiveness, you have nothing to write against it. The vendor's debt forgiveness, Form 1099-C will cause you to have income and have to recognize as income without any loss to write off against it.
Never, never, never write off expenses, debt off your book. You need these numbers.
It is suggested that you find a professional bookkeeper and CPA to help you.
As to the debt themselves, unless you plan to file bankruptcy for yourself or your business, or to close down your business, of course, you should try to resolve the matter with the vendors.
Please feel free to follow up.
Fiona Chen, MPA, Ph.D., CPA, ABV, CFF, CITP