What kind of entity issued the K-1? A partnership (1065-k1)? if so was is it a publicly traded partnership? (Part I line D).
When did you invest in the entity? How much did you pay? Was 2020 the only year you had this investment?
Did you sell the investment or did the entity shut down? How cash or other property did you get? ($100k?)
This is a super complicated area of tax law. Advice you get from this free volunteer forum may not be worth much. You might be much better off hiring a CPA, enrolled agent, or tax attorney for professional advice.
See also IRS Pub 541, especially the section starting on page 9 about adjusting partnership basis.
https://www.irs.gov/pub/irs-pdf/p541.pdf
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