just so you are aware as it may save you alot of effort, unless you requested an extenion back in 2019, the deadline to submit 2018 tax year returns to get the refund was April 15, 2022; the IRS won't provide a refund from 2018 any more.
if you rquested an extenion back in 2019, then you have until Oct 15, 2022 to submit the tax return so that you get the refund.
if you owe, then you owe, there is never a deadline.
