What’s the goal here? Is it just Install?
Also, it’s important to use videos and images. From experience, they have a much better performance than text. Also, if the app is on iOS, don’t run iOS campaigns in Google. Save the money and run them instead on Apple Search Ads. It’s a lot more efficient than Google.
Finally, what’s the MMP you’re using to measure performance? Google won’t give you the full picture. You need to know how many people opened the app after downloading it, what actions they took, etc.