Moments Together for Couples by Dennis and Barbara Rainey helped us the most. Devotions for a Sacred Marriage by Gary Thomas is another good one.
We started doing a short devotional at night after some rough patches (see this thread). Some nights we only got through a page because the conversation took over.
The Love Dare comes up a lot too. It’s more of a 40-day challenge than a sit-together devotional, but it can be good when you feel stuck.
Pick one and commit to a couple weeks before judging it. The first few days can feel awkward when things have been tense.