I got down leveled when I moved to big tech. Spent two years completely remaking the product I was tasked to work on, while the two other engineers on my team, both a level above me, cheered me on and didn’t do much. I turned our product from a total waste about to be cancelled into a promising tech with some momentum, but I spent all my time coding instead of writing about coding, and I likely won’t get promoted aga…
Would your perception about the org, team and self really change if you would get promoted?
If that's the case, then you could try to promote yourself. Especially, now that you've got a concrete result. It's just to show openly to the org and team that the promotion is what you want.
Package it with some outlook about how your contribution in the new role would boost the team and how timely you feel this is in your professional growth.