Simple solution would be to ask to do less, but make sure to frame it correctly. Since you were given more responsibility over time I'm making the assumption th

Simple solution would be to ask to do less, but make sure to frame it correctly. Since you were given more responsibility over time I'm making the assumption that the VP trusts you and your work. I'd suggest going to the VP and telling them that you're falling behind and it would be beneficial for you and them if someone else were either hired on or brought in to share the load. It's not a problem of you not being able to do the work, rather you're not able to find the time for everything.