The only advice I can give you from experience
is that prayer is ultimately the most efficient means whereby one may prevail against the obduracy of those whom we love: for it is not one who endeavors to change the other person but heavenly grace that liberates our loved ones' free volition from attachment to self and other temporary things. Such grace, however, it to be sought by prayer and penance.
Self-abandonment to the will of God, devotion to the Blessed Virgin Mary, and the earnest practice of the theological and moral virtues will enable you to be an exemplar whom your wife will acknowledge if only her free will is unburdened by self-attached and self-will. I would recommend you focus your energy on your children, praying for them, teaching them by word and deed, &c., so that your wife may awaken to the sublimity and profundity of the Catholic faith in all its luminosity. Perhaps if she sees how much your love the children and how you are all jealousy for their eternal welfare and the greater good of the household, maybe she too will remember that she does not belong to herself insofar as she is now a mother: a mother is never her own, and a married woman finds her freedom in maternity, and ultimately her salvation. This is as St. Thomas teaches when he comments on how St. Paul exhorts women to bear children: "Bear children
, and not kill them secretly by abortion: yet she shall be saved through childbearing, if she continue in the faith
[I Tim. v. 14]" ("Filios procreare
, et non eos occulte occidere per abortum. Supra II, 15: salvabitur autem per filiorum generationem, si permanserit in fide
," super I Tim. cap. v. lect. 2).
I especially recommend devotion to the Miraculous Infant Jesus of Prague. Please be assured of my prayers.