[snorkel]

It's not so much manager doesn't want to promote you as manager has no role to promote you into. Sometimes you can create a role and demonstrate to your manager that you are willing and responsible to manage that topic, and perhaps it needs added investment to grow that topic (more money and more people) which you will manage ... in other words don't wait for your manager to create the role to promote you into. Most managers are happy to team leads with this kind of initiative and will support them.

If you create the role but still your manager is unsupportive about it then you're probably in a team with a very narrow scope and there's just no further room to grow in that team, so time to move on.