Two points
1. Maybe its time to move on, problem with small tech companies is there has to be an opportunity for you to move into.
2. I wouldn't compare technical PM promotion to developer growth.
Otherwise, next time you have the "take more ownership" conversation don't hesitate to ask for specifics where you can do that. Development goals shouldn't be guess work.
I've been with this company for about a year, we just closed another $10M series B so at this point I want to figure out how I can leverage my position since we're without a doubt now very much in a growth phase. I've read about and heard about people who started out at as engineers at "growth stage" startups and then somehow leveraged their way to far more meaningful and high earning positions. I'm just reaching in the dark as to how one actually does that, aside from being a "good" employee and working hard.
Otherwise, next time you have the "take more ownership" conversation don't hesitate to ask for specifics where you can do that. Development goals shouldn't be guess work.