Hi Amber!
Where in Wales? I'm in Cardiff. Whatever you do, DEFINITELY get that tax return in. You will be subject to fines, even if you don't owe anything. I believe you automatically qualify for an extension through October. Double-check the IRS website. Things have changed with COVID-19 towards greater grace.
Also, you may still qualify for the stimulus, which is automatically deposited to whatever US bank account you used to receive previous refunds (if you ever did).
I highly recommend using the free version of TurboTax. They'll keep your returns in the cloud, so you can pick it up again next year. I am self-employed, so I use the paid version but did use the free version in the past.
You can do this!