You are very fearful of the charts. Birthday is clearly growing, just wait. It will be difficult if it starts to fall, but since it was released on radio it reaches a new peak every day.
People need to chill about the video views...
It's an 8 minute video, people don't have the time to watch it or probably don't finish all of it
Once the song gains more exposure the video views will come as well
I think the song will catch on more but people who have birthdays that are far away from now may not be buying the song currently. But because of that I think this song will have great longevity. People will request it months from now on their birthdays, DJ's will play it on their birthdays, etc...