Hi Yashkumar,
Thank you for your note. At a very general level -- based on your descriptions -- your undergraduate university, area of focus, work experience, and extracurricular accomplishments sound interesting, and could provide you with some basis to distinguish yourself from an otherwise highly competitive pool. I think you'd really want to bring those interests and experiences to life in your applications.
From a career goals perspective, you'll want to tell a clear, coherent, specific, and personal story about the origins of your interests, how those interests and your work experience now lead you to want an MBA, what your short- and long-term career goals are (very specifically), and why you need an MBA to achieve them. As characterized below, "General Management" and "Marketing" are very general.
On the job front, I would certainly not leave your current job unless you have a new one lined up. If you do have a new job offer that feels like the right move for you, continues to show career progression, fits in the pattern of your career arc, and is a place you'd want to be if your MBA plans didn't work out, then it seems like a rational move.
The main thing to consider would be how it might impact your recommendations from your current employer. You don't want to burn bridges from your primary recommendation source (where you've worked for 3+ years). And down the line (in your applications), you'll want to credibly and coherently string the story together of current job --> new job --> MBA. You don't want it to look like you took a new job, didn't like it, and are now "fleeing" to an MBA.
With regard to application rounds, we're already into the time of year when mobilizing to submit a series of quality round one applications would be very difficult. It stinks to have to take the GMAT again, but I do think it would be in your best interest, especially if you think you have another ~30 points in you. I'd focus heavily on score improvement (namely verbal) and then apply in round two.
Boosting your score will make you a more viable candidate for top 15 U.S. programs. For marketing, Kellogg, Fuqua, Ross, Columbia, Stern, and Anderson would be interesting to explore. I'd specifically highlight the New York (Columbia, Stern) and Los Angeles (Anderson, Marshall) programs if your interests remain fashion-oriented (which I happen to think is a better story than an outright career pivot).
I'd be happy to further this conversation via a Free Consultation, which would allow us to discuss things in more detail and with greater nuance. If that sounds interesting to you, please feel free to sign up for a Free Consultation via the link in my signature below. In the meantime, best of luck to you!
Kind Regards,
Greg