いつかの ... => Previously N4
Time
ひとつ…できない => cannot do the bigger things N3
Ability
ときているから/ときているので => because of ~ N1
のが好き/のが嫌い => Like (doing something)/Hate (doing something) N4
きらい => Hate... N5
Ability
つきましては => about; concerning; regarding N2
Cause, reason
につき => due to; because of; per; each N2
いつも => always; usually; habitually N5
~つい      => accidentally; unintentionally; by mistake N3
Regret
べつだんの => particular; special N2
Description
いつしか => before one knows N2
Accept, agree
いつか => Since when (Don't know) N4
Time