You've got to be more specific to get some help...like which Pixel phone are you using? What version of Android? If you have Tensor-equipped phone then you're probably on Android 13 or maybe 14 beta (and while this is really unlikely, maybe you've got a Pixel 6 series phone that for whatever reason you never updated from Android 12?)? And what APK (and version of the APK) are you trying to install? Android runs on many, many different combinations of hardware, so app developers have to develop various different versions of their app to support all these different combinations of hardware/software.
I suspect you're trying to install APKs that are intended for older versions of Android and are no longer supported on your phone's Android version. It's very, very likely the APK you're using is a 32-bit version and your phone requires an ARM 64-bit version of the APK to run.
See this article from Android Police: https://www.androidpolice.com/pixel-7-and-pixel-7-pro-32-bit-android-apps/#:~:text=Apparently%20Google%20just%20got%20tired,64%2Dbit%20for%20years%20now.