You can bypass Google account screen on your Galaxy A8 but first you need to know what version of Android is installed on your phone. You can find it the Android version in by booting into recovery mode.
Once you find the version, now search in Google or I would prefer YouTube with something like this “Galaxy A8 2018 Android 8 or 9 bypass”.
You’ll get many tutorials on how to remove Google account.
One problem though is, Samsung is releasing security patch update to these bypass methods that may not work for you. In that case you can also try an FRP Unlock Service that can bypass it within 5 to 10 mins but that downside is these services are paid.
Once service that I would highly recommend is by [https://www.progeeksblog.com/|Progeeksblog.com] they have amazing service as well as 5 stars ratings on Trustpilot.com.
Here is the link: https://www.progeeksblog.com/samsung-frp-unlock-service/
Hope this helps.
Thank you