Q - How do you reach out or approach one-star reviewers in order to ask about changing the review?
If the review is not legitimate, it can be reported.
If it is legitimate, then as an Owner a reply that acknowledges what went wrong and taking accountability is key.
In addition to a public reply, the Owner could contact the customer to talk over the phone on just how important reviews are and see if the situation could be resolved privately. In some cases, that review can come down.
A negative review is not as catastrophic as most Owners think. It gives you a chance to be real, admit mistakes, and show transparency as a brand.
