Question for Waitlist

Hi everyone,

I got waitlisted at, UCSD (dream school),

I am working very very hard on the San Diego essay before I join the waitlist and was wondering if I was to accept the waitlist what would be my chances of getting in?

Also, taking into consideration the addition in 2016 of 5,000 more students across the 9 campuses, how does this affect my chances?

THANK U ALL VERY MUCH