The NEAR Foundation has recommended the shut down of the USN stablecoin project, running on the NEAR Protocol. An initiative, known as USN Protection Programme, is provided for USN holders to swap their USN tokens on a one-to-one basis for USDT.e, on the NEAR network. Two organizations are facilitating this swap:

Decentral Bank can support conversion up to a total of approximately $40m, via permissionless smart-contract.
Aurora Borealis Limited, via this website, can support conversion up to a total of approximately $40m, via an off-line process involving KYC.

You can read more about the USN Protection Programme via this announcement by the NEAR Foundation.