Seeking career advice from Sr. designers: hitting a ceiling?

The simplest way to put this is you get paid for what you can do and not what you want to do.

If what you CAN do and what you WANT to do do not align, it is on you to correct that. Part of that is making it known that you want to shift, and seeking out advocates and mentors within the company. A good company will invest in you, but you have to do the work and make all the steps. You have to make it happen. It won’t always happen, and you have to know when your goals diverge from the place you work. They may need someone in your current role, it will help if you try to solve that problem. They may not need anyone in the role you want to have, then you need to make a tougher choice.