If you are sure you can get into UMD College Park, that is a great option, and you don’t need more safeties if you have guaranteed admission as a Maryland student. Look into that. Maryland is selective and outstanding for lots of majors and in a nice city. Case Western is in between in selectivity between say Northwestern, and Maryland.
Northwestern is a school where you may want to consider applying binding early decision, and then you need to be sure you can afford it, to up your chances of getting in.