[関「かん」]して => About A, With relation to A N3
Considering, Concerning
を[機「き」]に => Use A as an opportunity N1
Time, Situation
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
を[契機「けいき」] => As a good opportunity A, (do) B N2
Information, Report
に[決「き」]まっている => A is a given, A must be the case N2
Information, Report