The most reliable way to watch YouTube on older hardware is to use a web browser like Chrome or Firefox rather than an APK. Navigate to youtube.com.
SkyTube: Similar to NewPipe, SkyTube offers a way to browse and watch YouTube videos without the overhead of the official Google app. Youtube Apk Android 4.4.4
If APKs aren't working, your best bet is actually the browser. The most reliable way to watch YouTube on