Give your product away for free to people with a high social media influence in a niche area and ask them for feedback. Another way is to sponsor these (micro) influencers to post your product on their channels, or even hire them for long-term relationships as brand ambassadors. Since they have a positive reputation, people tend to associate this positivity with anything else they are involved with. This cognitive bias is called the halo effect.
Source - DigitalPsychology.io