Motivation to serve Krishna
It's true that work for fruitive results is not recommended in the Bhagavad-gita, because that will result in another temporary, miserable, material body. Thus, in Bhagavad-gita 3.9, we see that Krishna recommends work as sacrifice for Lord Vishnu.
It is always helpful to think of the Lord as the proprietor of your home, and your family members as His eternal servants. Then you can perform the activities of maintaining them as service to Krishna.
Some householders also have Deities of Krishna and perform some daily worship. All these things are meant to help us absorb our consciousness in thoughts of service to Krishna. With practice, in time, this will become our habitual way of thinking.
We're all spiritual beings, eternal servants of Krishna, so it's only natural that we should think and act this way. You should never give up your spiritual practice. It's the one area of activity that guarantees ultimate success in life—even if you think you're not practicing perfectly. Krishna appreciates your efforts.