your mobile is a USA carrier-locked version (S938U), which is why you aren't receiving regular updates in Pakistan. Carrier models require signals from that specific US company (such as AT&T or Verizon) to trigger updates, which isn't possible here.
You should flash your mobile's firmware from the U (Carrier) version to the U1 (Unbranded/Unlocked) version Once you switch to the U1 version, your phone will no longer depend on US carrier signals for updates. You will start receiving official monthly security patches and Android updates directly from Samsung over Wi-Fi, even while you are in Pakistan. It will also remove the unnecessary carrier apps that are currently taking up space
