I was at a loss for what to do next.

我不知道下一步该怎么办。

《柯林斯英汉双解大词典》

Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.

许多生态学家说，这些入侵物种仅次于栖息地的丧失，是对全球生物多样性的最大威胁。

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I'm at a loss what to do next.

我对下一步做什么心里没谱。

《牛津词典》

But career experts say that maintaining a professional network while employed is the best way to prepare for the next unexpected job loss or advancement opportunity.

WSJ: Keep Networking on the Job

There is no smoke without fire, though: their abject defeat in the tournament final may not have been in doubt, but a question mark was placed next to the loss to India at old Trafford.

BBC: Pakistan's continual crisis

Next is the loss of control.

FORBES: Paying for College: Saving Beyond the 529