はこれだけだ

this is all

→ は

phrase Uncommon #17,855

this is all Used to emphasize that something is the only amount, option, or action available. Often translated as “this is all I can do” or “this is the only one.”

JA: 私にできることはこれだけだ。

EN: This is all I can do.

君が今しなければならないのはこれだけだ。

This is all you have to do right now.

私たちに利用できる空気はこれだけだ。

This is all the air we have available to us.

話はこれだけだ

That's all there is to it.

— 暗殺の森 (1971)

今持ってるお金はこれだけだ。

This is all the money I have on me.

鍵はこれだけだ

This is the only key.

— ライフ・イズ・ビューティフル (1997)