Let your child lead the way, don't force play to happen. Sit on the floor and play with the toys yourself, try to get involved rather than 'supervise'. Expect your child to concentrate for short periods on each toy, game or story and then move on. Try to notice restlessness and change the activity accordingly. Give your child a new perspective by setting up a familiar toy in a different way.
Children grasp a new skill or idea by repeating it over and over again.
Don't be in a hurry to move on. But if your child won't play with anything else, gradually include different toys to introduce variation. If you have more than one child put aside some 'one to one' play time with each of them. Spending a few minutes a day with each child will help them feel special. If you are a single parent this can be especially difficult.