Use APKPure App
Get Assistant Quick Settings Tile old version APK for Android
ابدأ تشغيل تطبيق المساعدة الافتراضي من مركز الإشعارات
This app provides an alternative way to launch the assistant on devices with no home button to long-press.
It has no launcher icon, you have to add it to your Quick Settings tiles. Look for the pencil icon in the notification shade. You also need to set a default assist app in your device settings.
Source code is available at https://github.com/bndeff/qsassist