I agree with @surfcity that taking a gap year is almost always beneficial. Taking several gap years might be even more beneficial. College is always out there waiting for you. There’s no deadline for it.
Also, starting your career, well that can happen during a gap year(s). When you explore interests, and pursue passions, you will discover your career focus and build important skills that you can’t learn in school. I know people who worked all sorts of jobs, travelled all over the world, and decided to start college at age 23 or even age 26. In fact, many of the finest colleges hold room for what are called "nontraditional students.’ Smith college, for example, has the Ada Comstock Scholars program (https://www.smith.edu/admission-aid/how-apply/ada-comstock-scholars) Mt. Holyoke has the Frances Perkins program – https://www.mtholyoke.edu/fp. Columbia has the GS program. UPenn has a program too. Not all have great FA, but many do. Also look at Reed, Agnes Scott, Bryn Mawr, Simmons, Hollins. Hampshire, MIT, Harvard Extension, and many many others.
I don’t think that having a definitive plan for a gap year is necessary. What’s more important, to my mind, is allowing yourself time. Allow yourself time to think, to grow, to create stuff. You are at an amazing time in your life when you have few obligations (no family of your own, no sick parents, no sick children) and few debts (no school loans, etc.) You are relatively free to try out things. Maybe for the first time in your life. Maybe for the last time in your life as you will soon acquire other obligations soon.
Also, you are or soon will be an adult. You can make decisions on your own. It’s wonderful if you include your parents. Highly recommended, but you will be for the first time able to do things without their permission, if you so choose. It can be an exhilarating feeling.
If you want to take a year and play video games, I say: Go for it. maybe you will be the next big game designer. It’s a multi-billion-dollar industry. If that’s where your interests lie, then go for it.
If you want to travel to see friends, then do it.
if you want to hike the Appalachian Trail – here’s how to do it – http://www.appalachiantrail.org/home/explore-the-trail/thru-hiking
If you want to work someplace completely awesome – here are a few resources–
https://www.workaway.info/
https://www.coolworks.com/
https://www.thesca.org/serve/young-adult-programs
https://www.volunteer.gov/
Or work at any job you may find. Whatever you decide to do, you will find value and skills there, if you’re truly interested in it.
best of luck to you.