I’m less familiar with clinical and counseling programs, but I applied to social psychology, I/O psychology, and business management PhD programs this year. My advice is for the I/O direction, if you take it.
Your GPA is fine, but you will also want to do well on the GRE. Sometimes fellowships and other specific awards are based on these factors in place of/in addition to an assistantship, and you should start preparing now if you haven’t already. The RA experience is great - if the topics are related to what you want to study at the graduate level, even better, but not required. Depending on your internship, that could also look good for an I/O program if it is business/HR related. They tend to look more favorably on work experience than some other types of programs, since the research is very applied (which I believe is also true in clinical programs).
It’s hard to gauge likelihood of acceptance since PhD admission rates are so low. The program may only be accepting 1 applicant, or none at all in a given year. Or there may be several excellent applicants, so having a strong profile isn’t a guarantee. That’s when research fit and other subjective factors come into play. However, if you’re applying to reputable programs, most should offer funding if you’re admitted. And if you go the route of I/O, you may want to consider business management/organizational behavior PhD programs, too - the funding is often more than a psychology stipend, and you can do the same type of research.
That being said, some I/O PhD programs are more balanced in that they also focus on industry placements, not just academia (I applied to one program that had an internship/consulting requirement). If you want to pursue a business program for industry placement, you would be better to apply to a DBA program. Business PhDs are much more geared toward research/academic positions, while DBAs are for practitioners, though these are often unfunded (similar to psychology PhD vs. PsyD programs). Let me know if you have any questions about the different options I discussed
My advice is to make sure you’re applying to programs that are a strong fit for your profile, interests and goals. Don’t apply based on rank or prestige - if you don’t find the research interesting, it will be difficult to sell yourself to the faculty during interviews, and even if you manage an acceptance, it can be a painful experience to study things you’re not interested in.
I’m sure someone can offer more insights about clinical/counseling psychology, and if not, I know there have been many similar posts on the forum that may offer you some answers.