All of this will be colored by how long you have actually been there and the work you actually do, but-

I wonder if you are ready for more responsibility? As the scope of your work naturally broadens, and you get better at what you do, that can be an opportunity to move to working on bigger, harder problems that intrinsically have greater scope.

Also, don't forget that while it may feel like you are working your butt off, that doesn't mean your work is necessarily irreplaceable or core to the business's success. You put in tons of hours, attention, and energy, yes, but that alone does not make the work you do highly valuable.