Ask HN: How do you handle talking to your manager after missing a promotion?

I have been with my company for a few years. Over the past year or so, there's been a huge management change.

We had been a small agile team and have grown like crazy with a bunch of new processes and managers added into the mix. I recently learned that I was not given a promotion due to reasons outside of my technical ability or developer velocity. During my previous reviews leading up to this, there was never any indication that those reasons would hold me back and I specifically talk to my manager a few months ago telling them I want to get to the next level, and they told me they didn't see any reason why I wouldn't.

The new management that came in are making a huge push for diversity and most of the promotions were diverse co-workers, which is great.

But now I'm not sure what direction to go in? It's obvious to me that I'm not respected at the company. I'm not a 10x developer. I'm not diverse. My big skill is that I can get features working and I volunteer to work on hard problems that have no clear solutions.

I still like my company and I do enjoy working with my co-workers.

I'm planning on talking to my manager about what I can do better, but its really obvious to me now that my company just sees me as just a worker cog that is probably a dime a dozen.

I'm not 100% sure how to handle the talk with my manager and how do I make myself more indispensable from here on out?