By constant interactions and playing together etc children learn many things. And this socialization is what helps them in their family and work lives later. How will your children learn this very important art of human interactions?
This problem is not as big as it appears at first sight. Because:
The school environment is unnatural and the interpersonal learning from here is usually not directly applicable in the real world
In school, children become friends with other children in their class which also means other children of the same age. But in our later out-of-school life we need to interact with people of all age groups and all socio-economic backgrounds
Cruel children and their victims study together in school and this is harmful for both these groups
The correct way to deal with the world is probably learnt more by homeschooled children because this important art is transmitted to them by their own parents
The following steps can be taken to solve this big problem of your children not having a school full of friends:
Sending your children to extracurricular class where they meet other children everyday
To live in a place where our children can make friends who can play with them
Forming a bond with other homeschooling families so that our children know that there are other children like them