Junior developers barely "know" any technology. You're hiring them to learn. Completing multiple projects with different stacks is, to me, a better indicator than someone claiming to be good at a single thing. "Specialties" are not something a junior has yet.
As far as coursework, that will matter a lot for some companies and not at all for others. CS coursework is not very relevant for writing CRUD apps, but someone doing computer vision or geospatial software will prefer to see it.
Unfortunately you're in the same position as many other entry-level employees: the only way to stand out is through nepotism. Do you know someone you can talk to about pushing your resume to the right person's desk? Talk to that person.