Contact the IRS and setup a payment plan.

You could also get a waiver for the penalties and maybe the interest that is owed on that debt. Please make sure you keep good on the plan, or there will be drastic consequences. There are other options available to you as well.

First time abatement relief information:

https://www.irs.gov/businesses/small-businesses-self-employed/penalty-relief-due-to-first-time-penalty-abatement-or-other-administrative-waiver

The taxpayer advocate might be helpful as well

https://www.irs.gov/taxpayer-advocate

I'm sure other taxpayers and professionals who are more experienced might be able to help you on this forum as well Best of luck