This extension will give you the option to process a canceled order by setting it back to processing and update the inventory.
This package is registered on Packagist for easy installation. In your Magento installation root run:
composer require genmato/uncancelorder
This will install the latest version in your Magento installation, when completed run:
php bin/magento module:enable Genmato_UnCancelOrder
php bin/magento setup:upgrade
php bin/magento cache:clean
This will enable the extension within your installation.
When there is a updated version available, simply run (in your Magento installation root) to download and install the updated version:
composer update