上うえは

(Ue wa)

now that / since (formal, implies commitment).

Connection rules

＋V plain (non-past or past) + 上は.
＋Formal / literary — alternative: 〜以上(は) (slightly more common).
＋Main clause often expresses a required obligation or determination: 約束した上は、必ず守る.

約束やくそくした上うえは、必かならず守まもる。

Yakusoku shi ta ue wa, kanarazu mamoru.

Now that I've promised, I'll definitely keep my word.

「now that / since (formal, implies commitment)」

引き受ひきうけた上うえは、全力ぜんりょくを尽つくす。

Hikiuke ta ue wa, zenryoku o tsukusu.

Now that I've taken it on, I'll give it my all.

「now that / since (formal, implies commitment)」

Now that I have taken on the job, I will do my best until the end.

この仕事を___、最後まで責任を持ってやり遂げます。

Romaji also accepted