Become a sales engineer. You become part of the profit center.
I know a Principal engineer who did, and he says it's been very lucrative. This was a guy who ran his own business for many years, wrote a few books and everything, before being hired as principal engineer where I worked at the time. He stuck it out as a principal for a few years before going to sales engineering.
I asked him why the switch and he just said, "You make a lot more money in sales engineering".
I am not a sales engineer, but this describes my current role well. (Technically my title is "Cloud Solution Architect", but it's about the 4th title I've had for doing the same job for the same department)