You will waste time, risk your privacy, and still lose access in days.
You will be locked out within days.
If your phone cannot be updated past Android 4.4.4, you will likely need to upgrade to a newer device to continue using WhatsApp safely. Google has also dropped support for Google Play Services on KitKat, which affects the functionality of many modern apps. How to Download WhatsApp on Android 4.1 to 4.4.4 Download Whatsapp For Android Version 4.4.4
If you are tech-savvy, you can "Flash" a newer version of Android (like 5.0 or 7.0) onto your device using tools like LineageOS, which would restore Play Store access. Safety and Security Warning You will waste time, risk your privacy, and