Proactively applying for GDPR compliance

"Do we have to proactively apply for GDPR compliance by proving that we are compliant or we should make our product compliant without showing to any authority.
In short is it enough if I follow the guidelines and make the changes or will I have to apply/show it to some authority"

You must follow guidelines and regulatory requirements, implement changes to your product/organization without showing them to any Authority. However, Article 24 GDPR requires the data controller to be able to demonstrate compliance in case of controls by Supervisory Authority (the so-called principle of accountability).

Here you can find some information about how to implement EU GDPR
9 steps for implementing GDPR https://advisera.com/articles/9-steps-for-implementing-gdpr/
A summary of 10 key GDPR requirements https://advisera.com/eugdpracademy/knowledgebase/a-summary-of-10-key-gdpr-requirements/
If you need to understand how to implement EU GDPR in your organization, you may consider enrolling in our free EU GDPR Foundations Course: https://advisera.com/training/eu-gdpr-foundations-course/