Dghlcmugaxmgbm8gag9wzq

If we reverse dghlcmugaxmgbm8gag9wzq and try Atbash, we might get it, but manually it's tedious.

Since the instruction says "helpful piece" — if this is from a puzzle, the answer might be a word or phrase like "helpful piece" itself, meaning the decoded string is helpful piece . dghlcmugaxmgbm8gag9wzq

Given the symmetry, I’d guess the is that after applying Atbash, you get welcome to the puzzle or similar, but my quick attempt didn't yield that. If we reverse dghlcmugaxmgbm8gag9wzq and try Atbash, we