Convincing top management

Answer:
What is your first purpose, it is not clear from the question:
1. Do you need to convince top management that your organization needs to certify?
2. Do you need to convince top management that you are the right person to lead the certification project, already with a go decision?

If your situation is 1, I advise you to tell them about the advantages of certification for the organization. Use their language and motivation: profit, market share, new customers, ...

If your situation is 2, tell them about the advantages of being you the leader of the certification project: your motivation, your knowledge of the organization and its people, your experience, and if you can imagine that they will pont your weak weak points be prepared to presente them a list of actions that you will execute to minimize them.

For both situations you can try to find a sponsor, someone with influence over top management that can be your ally.

The following material will provide you information about convincing top management:
- ISO 9001 – 4 crucial techniques to convince your top management about ISO 9001 implementation - https://advisera.com/9001academy/blog/2017/12/05/4-crucial-techniques-to-convince-your-top-management-about-iso-9001-implementation/
- free online training ISO 9001:2015 Lead Implementer Course - https://advisera.com/training/iso-9001-lead-implementer-course/
- free online training ISO 9001:2015 Foundations Course - https://advisera.com/training/iso-9001-foundations-course/
- book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/