Since you don’t like your university, does it have domestic or international exchanges? Obviously you’d pick an area of the world you’re interested in/writing your thesis on, or a domestic university that is strong in the area you’re good at.
Can you complement your history major with stats for social sciences and poli-sci? Can you take graduate seminars? Can you politely ask the Head of the history department what areas of history Purdue is known for (us military history, East Asian modern history, history of the quotidian, technology in Ancient Times…) Since you’re meh about history in general, decide to develop your specialty in whatever Purdue’s known for. It’ll “signal” more rigor.
In September start looking for an internship for next year. Take all the workshops they offer about resumes, interviews, etc. Go to the career fair. Be polite but persistent at the career center since Purdue is Stem-focused and they may not be used to a History major (especially one with a disability). Due to your credits you’ll be able to apply to internships for juniors.
Are you close to a professor? Can you get involved in research? Can any of your papers be turned into a conference presentation?
All these elements would matter to your application. You don’t want to graduate in three years and be stuck.