Take a break in the morning hours after each subject to play a short game or go on a walk. This time will allow your child's mind to relax before making a transition into a new subject.
Offer a snack time in the afternoon to go along with a lesson. For instance, if doing a math lesson on adding and subtracting, use small pieces or candy or crackers to illustrate the concept. Allow your child to eat the snack after the lesson is complete.
Meet other parents who homeschool their children and make times to meet for a fun activity with your children. This will give your child an opportunity to socialize and integrate with other kids their age during school hours.