If I understand correctly, MMT and Keen by his math, would say that reducing the deficit removes money (credit) from the system, not a good thing if commerce is fading.*
Here, raising interest could be an option, but I'd say helicopter money into people's pockets.
note here I do not think growth should be necessary, because Bractaete system doesn't need, but we don't have it and monetary system needs interest and inflation to "work".