There is a useful tool I fond. It help me install GMS in my phone and Google Service is alright. By the way, your Android version should be 9+.
Mod Edit: Link removed
1- Download the GMS Installer and install the APK, open the app and press One Touch Installation, your device will automatically reboot and automatically install Google Play Services in Huawei eRecovery.
2- After your device booting back into system, check in Apps if the Google Play Services installed correctly.
3- Download the rest from APKMirror : Google Account Manager, Google Calendar Sync, Google Contacts Sync, Google Play Store, and Google Services Framework. Keep in mind you should download version that fit to your android version.
You can even update the Google Play Services to the latest version using the apk's from APKMirror.