You will miss the 3-yr window that you correctly identified, but you might still qualify for a reduced exclusion.

Don't hesitate to bring up specific questions that are preventing you to get started.

Seller(Lennar) already started selling for lower prices due to Coronavirus effect, can we ask them to reduce the price?

The federal government has been working proactively to prevent this. 

Stop or reduce meals out (again, easier these days). 

Look into ways you can reduce your outgo.

Now that that is accomplished, we’d like to know what other seasoned hosts use as standard practice that isn’t too restrictive in nature and doesn’t inhibit  steady bookings... but reduces risk to the property.  

You also should factor in lawn maintenance and preventative updates to your fireplace, central air unit, and furnace.

So instead they weld people into their homes to let them die (Communism vs Capitalism, I'm glad I don't live in China).https://techcrunch.com/2020/03/19/french-study-finds-anti-malarial-and-antibiotic-combo-could-reduce-covid-19-duration/

I offered asking on the property since it met the 1% rule and I could cover some missing or reduced rents no problem if we had issues with payments due to Corona Virus.