Often they have prestigious summer research programs. If accepted, you will have the opportunity to work with faculty on their research. Note, their programs are highly competitive. Also, typically, they do not admit more than one student per school. If so, you should find out whether faculty in the Department of Psychiatry are engaged in ongoing research.
Summers are a good time to obtain experience.
If so, apply for a summer job. Or, arrange with your university to do a research internship for academic credit. You have done well. You have solid grades and excellent course exposure. Also, you write well.