Dear friend welcome to your dost . Well after 15 years through marriage ,if there is boredom ,then you must realise that maybe life has been too routine and unexciting. Try to find out what are her personal interests ,passions,talents,aspirations ,and desires that she may have sacrificed and compromised . Try to prioritize her as a person and support and fullfill all her inner desires .Boredom usually comes when life is just repeating in a routine programme without any change in momentum and vibrations ,.There are basically 3 types of people ,auditory ,who like to hear nice words like i love you,you are nice ,appreciation,and acknowledgements etc some are visual they like to see things in order,neat ,clean,pleasant,nice stc some are physical type they are physical in nature like touching,huging,kissing, putting arms around ,they express by physical contact .You can try identifying which type your wife is and give her that expression in full.
Bring that boy out of you and awaken that girl out of her ,let there be some fun and frolic,mischief and play ,let the expressions of affection be alive all through the day , before you go to work, from work you can call up and inquire about her ,plan some outings ,etc make her feel important and a priority,ask what she wants attend to her interests and passions ,,all affections and fun of the day may end up as a grand finale in the end , Focus on respect,affections ,and be like a friend ,love will come by itself . help her in the kitchen,with the kid ,an normal chores in the house ,rub shoulders with her in all things around the house.
remember ,sex is not the priority ,but your respect affection friendship fun mischief ,empathy are the first priority. Ask her ,discuss with her ,say sorry if you have to , give her love . I think you have to revisit ,review and resurrect,and may be reprogramme your life , and change all things that are not helpful.try to know her ,understand her problem ,and help her come alive once again.never forget fun and play in your life.all the best .