Have you considered doing an OPM3 assessment? This might help identify next steps to take to improve project management practices and increase value. This does't have to be a formal assessment and can be conducted quickly.
You will also need to look at what value project management has provided. This may be difficult if there hasn't been enough time or you haven't adopted the best set of practices for your circumstances. But if you can identify value, be sure to brief the executive team on what you were able to provide.