I have:-
(1) solved all the clues
(2) identified the ‘consistent groups’
(3) ‘used the title as a key to match these groups to the digits 0 to 9’
(4) ‘encoded each cell’s contents to a digit’
(5) obtained all the extra letters to spell out information
(6) used the information spelled out to obtain an instruction
(7) obtained gobbledygook from my attempt to carry out the instruction in (6).
The instruction at (6) seems clear enough (I’ve taken the word [number] to refer to the first [number]), but I must have misunderstood something. Any nudge or hint would be greatly appreciated.