Waitlists really just feel random. Last year I was stuck on a waitlist for a school with a cohort size of about 8 until the very end of March, when I finally got the official denial. That same year, another school I applied to (that didn't offer me an interview) ended up with only half of their expected cohort size because they worked through their entire waitlist and still didn't have enough applicants accept their offer to fill their cohort of 15.
It's so frustrating to wait, but like others have said, it's more likely you'll get a decision later in the application season when applicants start settling on their decisions and schools know how many slots they still have to fill.