These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
Hello,
I could suggest following the steps here on how to troubleshoot common Nginx and Apache problems:
If you are still unsure at the end, feel free to share the logs here so that I could try to advise you further.
Regards, Bobby
The links are https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-as-a-reverse-proxy-for-apache and https://www.maketecheasier.com/name-based-virtualhost-apache/