This article helps you migrate from a bedrock structure to a flat WordPress structure.
Our platform uses a roots.io bedrock file structure. The database backup is within the /web folder. The wp-content folders you are looking for are located in web/app/
You all can move the folders into a standard WordPress folder structure and update the database file locations.
Move everything from web/app/ into your wp-content/
Unzip the database backup and import it into your new host. Then run the following wp-cli commands to switch from a bedrock file structure
wp search-replace /app /wp-content --all-tables
wp search-replace /wp/wp-admin /wp-admin --all-tables
wp search-replace /wp/wp-admin /wp-admin --all-tables
wp search-replace /wp/wp-login.php /wp-login.php --all-tables
wp search-replace /wp/xmlrpc.php /xmlrpc.php --all-tables