For now, just wait. The IRS commissioner testified to Congress that the IRS might be able to adjust people's returns for them, and send the additional refund due, but no official announcement has been made. If the IRS does not do an automatic adjustment, you would need to file an amended return. However, because of IRS backlogs it is likely to be 6 months or more before you see payment of an amended refund. So I think it's worth waiting a couple weeks to see if the IRS makes any further announcement for people like you who have already filed.
https://www.irs.gov/taxtopics/tc418
