よく => Often... N5
Repetition, habit
よく => good, well N5
Emphasis on degree
のが好き/のが嫌い => Like (doing something)/Hate (doing something) N4
ようやく => only just N3
Achievements
を契機に => as a good opportunity/chance to N2
Expected
ようやく => finally; at last N3
Achievements
よく(ぞ) => how wonderfully, how admirably N3
Exclamatory
ようやく => finally; at last N3
Achievements
を[機「き」]に => Use A as an opportunity N1
Time, Situation
よく(も) => How the hell is it possible, that ...? N3
Surprised
よく(も) => How the hell is it possible, that ...? N3
Criticize
なくともよい => don't need to do something ... N2
Necessity, obligation