What’s the plan B for people to be able to vote by mail if USPS doesn’t function?

I’m seeing a lot of responses that people should just drop off their mail-in ballots but if USPS doesn’t function/is delayed substantially then won’t many people simply not receive these ballots in the first place?

I know several people personally who requested mail-in ballots in Florida in the (extremely close) 2018 election and never received the ballots in the mail. Many didn’t end up being able to vote as a consequence.

Is there a strategy to convene existing delivery providers like UPS, FedEx, Amazon, etc and broker some sort of deal to help make mail-in voting accessible in this election if USPS fails to do so? Who’s leading that strategy? Who’s covering the additional cost?