(As a CTO coach, I'd say book a coach but ...)
Tell your boss. If they don't know there is no chance to be promoted. Ask what it takes to be promoted.
Know the boss of your boss. Only they can promote you to the same level as your boss. Your boss usually can't (Most important promotion tip).
Try to get some management into your job title for no salary increase. This makes it easier to switch jobs and be hired into a management role.
Try to become co-founder (CTO) in a small startup.
Found a startup on your own, easiest way to get the CTO title. Build for one year, close the startup if it doesn't work.
(As a CTO coach, I'd say book a coach but ...)
Tell your boss. If they don't know there is no chance to be promoted. Ask what it takes to be promoted.
Know the boss of your boss. Only they can promote you to the same level as your boss. Your boss usually can't (Most important promotion tip).
Try to get some management into your job title for no salary increase. This makes it easier to switch jobs and be hired into a management role.
Try to become co-founder (CTO) in a small startup.
Found a startup on your own, easiest way to get the CTO title. Build for one year, close the startup if it doesn't work.