Worth sticking it out to become senior?

I started at a mid-tier firm right out of college and have been here 15 months. I will most likely be promoted in another 10 months (December 2017) but I know public accounting isn’t for me and I want to go private. I’m wondering if I should stick it out til I get promoted then work another busy season since I would feel guilty quitting right after I get promoted and before busy season and don’t want to burn bridges. I’d like to work in higher ed or NFPs. All suggestions are appreciated! Thanks 🙂