I want to look for a feature on ALB AWS that can update http to https on its own just like in the NGINX load balancer , currently I have a website that uses wordpress but when using ALB, the website only shows text , is there another way to upgrade the url from http to https without having to edit the code?
Yes, you can redirect http to https as explained in AWS docs:
For that you need your own domain name. Once you have the domain you can the SSL certificate for HTTPS from Amazon Certificate Manager which you can deploy on your ALB.