なけりゃ => If not ... N2
Condition (hypothetical condition)
じゃありませんでした => was not, were not N5
Emphasize negative meaning
ないと/なくちゃ/なきゃ => must do; need to; gotta do ~ N3
をかわきりに => Starting with A N1
Miscellaneous
きり => Only A N3
Degree. Level, Amount
~をかわきりに(~を皮切りに)      => One after another; starting with ~ N1
きり => only; just; since; after ~ N2
きり => only; just; since; after ~ N3
じゃありません => not to be N5
Emphasize negative meaning
んじゃなかったか => shouldn't have... N4
Regret
ときとして => sometimes... N2
Trend
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1