Local keyword ranking drop

My keyword was ranking well before google may SEO update, but after update their ranking has been dropped, I have done many things to get back their ranking but nothing happened.
Pls suggest me tips to recover them back.

Buy some google reviews maybe better than local keyword ranking?

What kind of things did you do? Answering this will let us give you better info to help.

A lot of people's ranking has been returning to normal now.

I hope you didn't change your content to an extreme level where it would've affected your ranking since it might have returned to normal by now.