If you need to run just a cron process per its code, the fastest way is using n98-magerun2 tool, if you are not familiar with, this is a command line suite of tools that make development easier.
You can install it with those basic steps:
# Download the phar file in your magento root directory
# Execute the downloaded .phar file
chmod +x n98-magerun2.phar
# Its recommended moving it into /usr/local/bin.
# It will give an ability to run n98-magerun2.phar from any place of
# your file system via command line.
sudo mv n98-magerun2.phar /usr/local/bin/
# List all available commands just type the following line in your terminal
Once n98-magerun2 is installed properly, you will be able to run your cronjob as follows in yuor magento root directory:
n98-magerun2.phar sys:cron:run <job_code>
For more information about n98-magerun2 you can review this link