As amazing as you already are, you can be even more so.

【答】这个句子不缺成分。

As amazing as you already are, 这其实是一个让步从句，主要用于美国英语。在通常情况下，第一个as不用：Amazing as you already are, you can be even more so.

表语amazing 置于连词as之前，构成让步从句。相当于：

Though you are already amazing, you can be even more so.

【翻译】虽然你已经很了不起了，但你可以更要这样（“这样”也许指“谦虚”吧）。

在美国英语中，通常使用as...as...引导让步状语从句。例如：

As cold as it was, we went out.

= Cold as it was, we went out.

尽管天气冷，我们还是出去了。

As successful as he is, he is not proud.

=Successful as he is he is not proud.

他虽成功了，但不骄傲。