Reviews are not changeable - if you mess up, you can always fess up. Moderators do it all the time - we chat or fix as needed when we mis click, mis read or just mistakenly think. Better to go back and fix it in my experience.
Good thinking taking action to hunt it down and flag or otherwise get the result you wish you had chosen initially.
Since you didn’t link to your question in the body, I’ll assume you want general advice. The people that have been here for a long time have assembled our collective wisdom in the help section on asking.
Have you read the parts about promoting, editing and asking? I’d be happy to look at your question and see if ...