Hi guys,
I was able to get an earlier appointment and booked for April 2024. I started the application in July 2023 and have been rescheduling when I could. Initially, I got Oct 2024 time slot for Vancouver but kept checking for earlier.
Received an email from Vancouver Consulate titled "You might qualify to schedule an earlier U.S. Visa appointment " and was able to reschedule for April 2024 same day.
So I think as soon as you get this email, they open up slots for you, not everyone else sees it. I'm not able to reschedule anymore now.
So just wait for the email. All the best!