Yes, I have followed your guide as you provided. also, I have applied all changes in /opt/bitnami/apps/wordpress/htdocs/wp-config.php file. but the problems same as it is.
also got some new error with the site I really don't understand what happening with my website when I'm going to install on the theme I got 503 error as I describe you.
Currently, I'm trying to Optimize Performance of my website with these plugins as theme support team provide(suggest) to me (W3 Total Cache Autoptimize EWWW Image Optimizer Far Future Expiry Header) but after installed getting same error 503. Could you please see this why this happing doing only with me.
I have attached the error image.