For other schools, you apply ED. Since Michigan doesn’t offer it, you make it as clear as you can that Michigan is the top choice: a really strong “Why Michigan?” essay; certainly a visit.
I found this in a UM admission blog post from 2017: “Likewise, a student’s interest in the university – as demonstrated through coursework and essays – and fit with our institutional mission and goals have become increasingly critical in distinguishing a top candidate among such a large and qualified pool.”