Changing careers

I have been running my own retail clothing boutique for 9 years and I am truly burned out sometimes. I have employees and I have learned to step aside and delegate most of the tasks to my staff. My youngest child started school full time this year and I decided to try substitute teaching to help out at the school and possibly transition into a new career if it suited me. I also got my real estate license a year ago and have been part time in that business as well. Unfortunately, I don’t feel truly in love with any of these options and aside from real estate which isn’t a steady income, they don’t pay particularly well either. I’m wondering if other women have insight into switching careers as children age. I recently got accepted into grad school starting in January and I plan on pursuing my MBA but the student loan debt I know I’m going to take on is daunting. I feel really nervous about the position I’m in and not sure of what I want to do in the future. I keep hearing that I need to focus on one thing and not try so many different things but I don’t know how I’m supposed to see if I like something without trying it. I also don’t know what to say to people when they ask what I’m doing career-wise. I feel like I should be further along in my career by now but I have made my kids more of a priority than I ever expected to before becoming a mom. I’m struggling to transition back into the work world gracefully and incorporate motherhood. Before kids I was in the corporate world in marketing and advertising. It’s been almost 10 years since I worked in a corporate environment and I feel nervous about making any decision. I feel stuck right now. Any advice?