Android 4.4.4 devices often have only 4GB-8GB of internal storage. Go to WhatsApp > Settings > Storage and Data > Manage Storage. Delete old forwarded videos and large files. Better yet, move WhatsApp to an SD card if your phone supports Adoptable Storage (uncommon on KitKat).

While official support is gone, some users attempt to use older versions via third-party repositories.

. To continue using the service, you must have a device running Android 5.0 or newer