Look for such services from professionals. Or better yet, go to companies that have been doing this for many years. I recommend you go to this company for professional ASO services https://seotwix.com/app-store-optimization  . They will help you greatly increase the number of downloads of your app. How they helped us, thanks to their services the visibility of the app increased by 46.3% and the number of downloads increased from 20,000 to 190,000 and now we have almost 420,000 downloads.