I was collecting too many links in too many places. So here is one central depository for the links I have about devotion to the Sacred Heart of Jesus.

Resources not mentioned in other posts on this website:

Hey, did you hear? Pope Francis intends to write about devotion to the Sacred Heart! Due out in September of 2024. Stay tuned for updates! https://www.vaticannews.va/en/pope/news/2024-06/pope-general-audience-sacred-heart-jesus-document-appeal-peace.html

Conversations with God on the Sacred Heart of Jesus, by Donald Wallenfang
https://www.unleashthegospel.org/2023/06/conversations-with-god-on-the-sacred-heart-of-jesus/

St. Josemaría Escrivá on the Sacred Heart of Jesus | HOMILY
https://www.youtube.com/watch?v=0q0ePDYT1uI

Miles Christi blog articles (search on “promise” and “heart”)
https://www.mileschristi.org/blog/

Here are some resources in regard to the fact of there being a 350th anniversary to celebrate.
(I had sent them to a parish secretary):

Good morning, thanks for speaking with me on the phone just now about finding more information on the 350^th anniversary of the Sacred Heart devotions. I agree, it is hard to locate anyone who thinks this is a big deal. Well, maybe we can make it a big deal, right? Who knows, maybe the pastor will be inspired. Anyway, here are some Catholic sites, as you requested, with a bit more information. God bless!

This first one is an article from America, the premier national publication of the Jesuits in the English language:
https://www.americamagazine.org/faith/2023/06/16/feast-sacred-heart-245506

This next source is a religious order, the Sisters of the Visitation:
https://visitationspirit.org/2024/01/opening-events-in-france-for-350th-jubilee-of-sacred-heart/

https://visitationspirit.org/2024/03/350th-anniversary-of-sacred-heart-apparitions-part-1/

Here are some pages from other Catholic dioceses (not Detroit aod.org) that show they are trying to recognize the anniversary:
https://dioscg.org/sacred-heart-pilgrimage/

https://www.peterboroughdiocese.org/en/get-involved/jubilee-for-the-350th-anniversary-of-the-apparitions-of-the-sacred-heart-of-jesus.aspx

And our own, local, Detroit area pilgrimage company—Corporate Travel—in Northville, MI, is advertising a pilgrimage for the occasion:
https://welcomehisheart.com/catholic-pilgrimage-to-france

https://www.ctscentral.net/travel-tours/returning-love-for-love:-a-pilgrimage-to-the-heart-of-jesus

Resources copied from the individual posts #1 – #4 on this website:

https://www.thedivinemercy.org/articles/twelve-promises-and-great-promise-sacred-heart

https://www.ewtn.com/catholicism/library/the-revelation-of-the-sacred-heart-of-jesus-paral-le-monial-france-13719

https://www.therealpresence.org/archives/Sacred_Heart/Sacred_Heart_001.htm

https://www.catholiccompany.com/magazine/12-promises-sacred-heart-of-jesus-2-6075

https://catholicexchange.com/falling-love-knowing-sacred-heart-jesus/

Heart of the Redeemer, by Dr. Timothy T. O’Donnell

The Devotion to the Sacred Heart of Jesus, by Rev John Croiset