How can you improve the sentence "When faced with criticism, even unfairly, you reflect and make improvements to avoid it in the future."?

Whenever and as far as possible, try not to embed a clause in the middle of a sentence. It automatically sets up some degree of ambiguity or readability problems.

When faced with criticism, even [if] unfairly, you reflect and make improvements to avoid it in the future.

(17 [18] words)

There are any number of ways to tighten it up. Here are two:—

When facing even unfair criticism, you should reflect and make improvements to avoid it in the future.

(17 words)

Even in the face of unfair criticism, try to reflect and make improvements to avoid it in future.

(18 words)