I don’t know anything about the industry but that actually seems like an important role and good job security. Seconding the point about not getting promoted into a position that’s a poor fit/stresses you out. If you’re financially secure and not hating it a job can just be a job.

But if it’s getting too stagnant you could ask for a side project or (lower pressure) take one up yourself? Do you have enough comfort with your boss that you can bring this up?