The sexual libido has completely disappeared.

What would you, women, advise me as a man?

To help his wife take care of the child. Preschool children, they are such that even the mother's toilet is not allowed to go alone. When to think about sex?
And you are seriously engaged with the child: take / take to kindergarten / school, cook dinner for him, play in machines / dolls, take a walk. And not one day, but on a regular basis, at least six months.

The main thing is that in the end we do not read a similar message from the wife of this man. Say, the child is almost eight, the husband is good, the child is engaged, but absolutely ceased to want me, and I am a year without sex!