For those who seek an immense reward, let us be reminded of the Six Days of Shawwāl.
من صام رمضان ثم أتبعه بست من شوال كان كصيام الدهر
“The one who fasts Ramadan and then follows that with six days in Shawwāl, it’s as if one fasts in perpitude.” — Abu Ayyub, recorded in Sahih Muslim, 9/#1254