the full home sale exclusion can only be used once every two years. a partial exclusion would be availible
you sold one home on 7/30/2021 and apparently used the home sale exclusion to avoid tax on the $150K gain
if you sell the current property before 8/1/2023 the reduced home sale exclusion will apply since the two sales within two years rule would apply.
so roughly speaking there is about 660 days between your last home sale exclusion (7/30/2021) and the current one planned for 5/23/2023. 2 years is 730 days so 660/730 is about 90% of the maximum $500K exclusion.
