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あまり得意じゃないん

not very good at

→ 余り
phrase Rare #36,506
not very good at 得意 means being good at or skilled in something. The ending ん adds an explanatory tone and is commonly followed by だ or です.
JA: 私は歌があまり得意じゃないんだ。
EN: I'm not very good at singing.

紅茶はあまり得意じゃないんです。

I'm not really a fan of black tea.

残念だけど、ダンスはあまり得意じゃないんだ。

Unfortunately, I'm not very good at dancing.

料理はあまり得意じゃないんでしょう？

You're not very good at cooking, are you?

フランス語、あまり得意じゃないんでしょう？

You're not very good at French, are you?

これはあまり得意じゃないんだ。

I'm not very good at this.