Because when you pray to God, you are also praying to the Holy Spirit who is living inside your husband. I promise, it/he/she/that spirit will do a much better job of leading him than your frustration ever will.
This is part of marriage. It’s not as if one of you is choosing to only be 20% or 50% or whatever percent. The percentage may be dictated by what’s going on with your job, with your children, or with your family.