if there is a loss carry forward on the K-1, that should net against any capital gains YOU had on your 2019 tax return. If the net of the K-1 capital loss and your capital gains exceeds $3000, then you will be able to reduce your ordinary income by $3,000 and carry forward what every loss is left and repeat that process each year into the future until the losses are consumed.
As this is a final K-1 from an estate, those capital losses should be for assets sold after the date of death at a loss from their value as of the date of death. If the losses occurred prior to the date of death, then they should have disappeared as part of the 'step up' process.
