DEVALUED RATING

Hello, for several years, my film Surviving Bokator has received excellent reviews and ratings from critics and audiences alike.  this was reflected on IMDb where I held a steady 9.4 rating.  I am a western filmmaker and my film is not political nor does it make any statements to that effect.  Recently, Surviving Bokator was caught in the crosshairs of a culture war launched by Thailand against Cambodia (where my film takes place).  It was attacked by Thai loyalists who have never seen the film and given ratings of 1 and 2, which downgraded my overall rating.  https://www.imdb.com/title/tt9135286/ratings?ref_=tturv_sa_3 (also See attached). 

How can this be repaired or can a system be instituted to ensure that non-audiences or amateurs cannot rate a film.  thanks.