Have another go at (4)
(Other definitions for redo that I've seen before include "Carry out again" , "Start again" , "Have second thoughts" , "Create again" , "Decorate (eg a room) again" .)
(Other definitions for retry that I've seen before include "Hear (a case) again" , "Advice following failure, initially" , "take second opinion on case" , "Have another go" , "Make a further attempt" .)