Not sure this clarifies anything, but your motivation is your own problem.
Remember that getting into (and completing) grad school is about research first and foremost, your ability to complete the required coursework second, and everything else a distant third.
Your GPA is a little low for “top” programs, which may have typical admitted GPA’s above 3.5.
Your Honors Project and REU may be relevant if they lead to publications and/or strong letters of recommendation, but most good applicants to “highly selective” programs will have a research background that gives them this kind of advantage.
Your coursework matters only in the narrow subfield where your prospective research group works, so the numbers don’t matter, just how well you are prepared in that area - a few grad-level courses are more preferable than a larger number of senior-level courses.
Your other experience probably doesn’t matter unless it relates to your prospective research topic. Internships are usually about business and industry, not research. Campus organizations can give you research experience, but usually don’t. I can’t possibly talk about the impact of a “summer-operating partnership” without more information.