I am in a similar boat as you. 8 years as an engineer at my current company. I make almost 3x what I originally made when I first got here. I found a niche that allows me to do the work I enjoy and I make sure that I am good at what I do. I would tell my boss to set goals for me, both professionally and personally so I have something to work for. It also allows me to have ammo when raises come around.

Another thing I made sure to do is promote and keep up the work culture that my company likes to tout publicly. Ive been told that I set the attitude for the part of the company I am a part of (in charge of, sorta) and that they are happy that the most senior department is the engineering one. My managers enjoy that they can throw me the keys to a project and it just gets done, I like the role I am in and they do what they can to make me happy. Ive been offered to go higher in the org but I just dont want the added responsibilities.