At this point, unless Congress extends or “improves” or creates another form of payment, it is lost. BUT I notice you talked about your 2018 return. Did you earn less in 2019? That’s the return you must file by July 15th. If you would have qualified based on 2019 income, you can claim a credit when you file your 2020 return next year. The credit would be the full amount minus the smaller amount you received!