From my experience (mostly from interviewing for jobs) the quality of your experience in your extracurriculars is more important than the quantity of them.
It is much more valuable to have a couple that you were very involved in, took up leadership roles in, etc. Than a whole lot that you just casually participated in. "Specializing" (if you can call it that) in a couple extracurriculars will, in my opinion, show dedication and loyalty, and gives you more to talk about in interviews (in my job interviews at least, I got alot of questions about the leadership roles in extracurriculars on my resume)
So, more extracurriculars can't hurt, but I would make sure that you get very involved in 1 or 2, maybe try to take up a leadership position in your honor society.
