pls see this article.
it says : "The man in this example could have moved back into the house for two years and sold it with a much smaller tax burden, but his girlfriend, now his wife, wasn’t up for it."
https://turbotax.intuit.com/tax-tips/home-ownership/tax-law-for-selling-real-estate/L9PmDNkK5
so, I guess if I move back and say for 2 yrs and then sell- that should avoid tax
