Small Business Ideas/getting Off The Ground

Hello, I would like advice on starting a new business. For reference I am a 17 year old in high school and I am in an entrepreneurship class where we speak to business owners 3x a week for an hour at their business. I am seeking even more guidance about a 2nd business for me to start. I have a small car detailing business/side hustle that nets 3-4k a month from May through October. But living in Minnesota I would like to jump to another business that I can be sufficient with year round and manage while taking classes. I was thinking a social media marketing business that has a specific niche towards something like real estate, or real estate photography. If anyone has any ideas on businesses with a relatively low barrier of entry I can get into and manage while in school that’d be great. Also, maybe some advice on how to get started.

Thank you!