あげるね

I'll do it for you

→ 上げる
phrase Uncommon #15,697
I'll do it for you あげる indicates that an action is done for someone else's benefit; ね makes the offer sound friendly and reassuring. Depending on the relationship, あげる can sometimes sound patronizing.
JA: 荷物を持ってあげるね。
EN: I'll carry your bag for you.

すぐ新しい棒みつけてあげるね

I'll find you a new stick right away.

— ハウルの動く城 (2004)

何か飲み物を持ってきてあげるね。

I'll bring you something to drink.

おいしい夕食をつくってあげるね。

I'll make you a delicious dinner.

私が教えてあげるね

I'll teach you.

— 映画 聲の形 (2016)

お茶を入れてあげるね。

I'll make you some tea.

私が代わりに→消してあげるね→

I'll delete it for you instead.

— 映画 聲の形 (2016)

買い物と、家の掃除、それから夕ご飯作ってあげるね。

I'll do the shopping, clean the house, and make dinner for you.

じゃあ、みんな、お迎えが来るまで、先生が絵本を読んであげるね。

Alright, everyone, I'll read you a picture book until your parents come to pick you up.

水足してあげるね

I'll add some water for you.

— 崖の上のポニョ (2008)