My first job since graduating college in 2016 is at this PR firm I am currently at. I have been here for going on 8 months, I started as an intern then within 3 months, I received a promotion to account coordinator because of what I was able to accomplish  as an intern. I have quickly realized this PR firm is behind the times in regards to technology, co. culture, and most importantly I am vastly under paid by almost $15k for my position and the geographical location I am in. I have started looking else where as an account coordinator but I am concerned I may have to take another internship role. What would be your advice for me if I am asked why I am looking for work so quickly? How could I make the case I am qualified to take on an account coordinator role at another agency?

Thank you for your advice,
Help Seeker