Getting 500 Internal Server error for Laravel 5.8

I have just pulled my git project on my live serve. I am getting 500 Internal Server error on all the pages except the public/index.php

I have checked what OS and version the server is using and it is:

NAME="Debian GNU/Linux"
VERSION_ID="8"

I have ran these commands below:

/usr/bin/php7.3-cli composer.phar install 

I have tried to run composer update but I am getting the below error:

/usr/bin/php7.3-cli composer.phar update

This is the error I get:

mmap() failed: [12] Cannot allocate memory

Fatal error: Out of memory (allocated 599793664) (tried to allocate 20971520 bytes) in phar:///homepages/12/d490/htdocs/staging/composer.phar/src/Composer/DependencyResolver/RuleSet.php on line 90

I have generated a new laravel key by running the below command:

/usr/bin/php7.3-cli artisan key:generate

I am not sure as to what I can do to get this issue resolved. Thanks in advance

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