Lots of good kinds of physical activity that are not team sports. At age 6, our kids were taking swimming lessons. Both took dance lessons too. Recreation soccer for 6 year olds is really not about playing soccer. It’s about some of the skills needed to play in the future. We know young kids who took martial arts classes, and they are very good for helping develop discipline and self control. What about gymnastics?
Or just going outside and playing at a playground, riding a bicycle, going for walks, making a snowman.