Always getting blank page on all Laravel routes

I am always getting blank page while accessing my Laravel project given below. Please advise how this problem can be resolved. Thanks!

http://1.231.118.4:9000/

http://1.231.118.4:9000/admin/login

Apache 2.4 PHP 7.2 MySQL 5.7

phpinfo: http://1.231.118.4:9000/info.php

vhost:

<VirtualHost *:9000>
    ServerName 1.231.118.4
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html/ico/public
    <Directory /var/www/html/ico/public>
        Options Indexes FollowSymLinks MultiViews
        AllowOverride All
        Order allow,deny
        allow from all
     </Directory>
    ErrorLog /var/www/html/ico/error.log
</VirtualHost>

.htaccess:

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews -Indexes
    </IfModule>

    RewriteEngine On

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} (.+)/$
    RewriteRule ^ %1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

Answer

In my appProvidersRouteServiceProvider.php file, the routes were serviced on 443 port that’s why I was getting 404 on all routes. Thanks everybody anyways.

    public function map()
    {
        switch(request()->getPort()){

          case 9001:
                //exit;
              break;
          case 443:
              $this->mapAdminWebRoutes();
              $this->mapApiRoutes();
              $this->mapWebRoutes();
              break;
         // choose a port that is not used by another server
          default:
          $this->mapAdminWebRoutes();
              $this->mapApiRoutes();
              $this->mapWebRoutes();
              break;
        }
    }