To increase marital love

In addition to the behavioral changes needed to improve the marital relationship, the pious have mentioned that making intense supplication for it after the recitation of the following portion of verse of Holy Quran hundred times daily is also beneficial,

و القيت عليك محبت منى(Sura 20: 39)

It is best to send salutations (durood) on the Holy Prophet (Allah bless him and give him peace) eleven time prior and after the recitation.