The Google Play Store, which is where most customers install your Android apps from, recently made a policy change regarding older versions of apps. This is explained in detail in Google's documentation available here, but is summarised by the below paragraph

"If your existing app’s target is below API 30, it will stop being discoverable to all Google Play users whose devices run Android OS versions newer than your apps’ target API levels"

In simpler terms, it means Publish apps that haven't been updated since Early 2020 won't be discoverable on the Google Play Store.