WFH tax relief, and how to claim previous years

I work in a full time role at home, but also complete Self Assessment due to some freelance work. I didn't claim the WFH tax relief during 20/21 and now unable to amend my return from that year. Is there anything that can be done? Basically another way to claim that money? Thank you, Matt

Hi Matthew Brown,
As the timescale has passed to amend online you will need to submit the amendment in writing to review:
Self Assessment tax returns
Thank you.