This is a question that I have been asking a lot since the COVID Pandemic started. Seems a lot of folks became coaches and personal trainers overnight online.
What should you look for in a coach? First and foremost, someone that knows the game or the sport. You would not hire a football coach that never played the game. You would not hire a basketball coach that never played the game. But people spend good money paying lifting coaches and personal trainers that have no qualifications other than they go to the gym themselves.
If you want a coach that will push you to the next level and improve your fitness and strength, look for one that has been there. If you want a powerlifting coach, find someone that has actually competed more than once or twice themselves.