What is the method for treating ill-wishing and conceit, and how can one atone for the sin of wishing for a male child out of fear of others' gloating?

Allah has forbidden ill-thoughts, and what is prohibited is persisting in them until they settle in the heart. The remedy for ill-thoughts is to recall the prohibition against them and to avoid seeking evidence for what is merely suspected. As for disliking daughters, it is an ignorant practice forbidden by both Islamic law and reason. If the reason for desiring a male child is fear of schadenfreude from another woman, there is no sin in that, and seeking forgiveness in such a case is a good thing.