APK + OBB doesn't work on many other phone brands, to resolve the problem, first find a way to reduce the exported android installation file size as well as using aab instead of apk.
Next version will need to explore addressable and hosting files on Content Delivery Network.
First check for the files that is large after exporting as apk. this can be accessed by console
Android play store accepts aab in 150mb instead of 100mb apk with obb. Unity can export the aab format by selecting this at build settings
