In the US at least you can try homeschooling, and if it doesn’t work for you or your child they can just return to school. In the state I lived in when unschooling three kids, Oregon, public schools allow homeschoolers to participate in sports and other activities. It’s not an all-or-nothing or permanent choice. Kids change schools all the time, which can prove just as disruptive as taking a year to try something different.