Agree this meaning, but what about 'Now what shall I do? - this works too, I think???
If you want to say should you will need to use subjunctive form not future.
Does anyone know if discussions are monitored in Beta mode, or do you have to specifically report errors?
It's much easier for those developing it if you report it directly on the error.
What shall I do now is more correct but was marked wrong. Learn proper English, Duolingo!