Struggling with decision regarding job

I’ve been encouraged to apply for a promotion to my current supervisor’s job since she is leaving soon. There’s no guarantee I would get the job, but I think it’s likely I would have a strong chance depending on the other candidates. It’d be higher pay and more responsibility, and would take away some of the aspects of my current job that I dislike. However, I’d also suddenly be managing what are now my current peers and friends, and I believe some of them would have a hard time being supervised by me. That, along with the fact that my overall vision for my life is being an entrepreneur and becoming a web designer/digital marketer, the promotion doesn’t fit my vision. As I’m writing this, I’m having a bit of an ah-ha moment that I don’t actually believe my vision is attainable. I want it to be attainable, but I don’t really, truly believe I can do it. I’m struggling because I don’t know how quickly I’ll be able to leave my full time job to be an entrepreneur, and I’m worried I could either lose focus on the side hustle because of the new job OR end up getting a promotion and then quitting within a few months. I’ve tried the model on a few of the thoughts associated with this (there are so many!), but I’m still struggling and need some guidance. Thanks in advance!