Your only option is to keep trying. Use @DoninGA 's instructions above.The worst times to reach them are Mondays and Fridays. Best times are early in the day on Wed - Thursday. Other folks may have experienced differently.
Unfortunately, this has been the case for some time - it is extremely difficult to reach the IRS during normal tax seasons and the work limitations of COVID-19 have made it even worse.
Some IRS local offices may be taking physical appointments. See IRS Local Office Locator for additional information.
