The "main move" you do in your routine is explained by Guy Hollingworth in his effect "Waving the Aces" in Drawing Room Deceptions.
Im not entirely sure if Guy Hollingworth invented the sleight but he certainly published it before you. The only difference I saw is that Guy does it with one hand and you are using 2 hands for additional cover (not needed in my opinion).
The idea of prodcuing an indifferent card and then changing it to the selcted card isn't very original either.
I guess thats why it got declined
As a general tip for making your trailer:
use different camera angles to make it more exciting to look at for your viewers. A 1:59 min long steady camerashot gets quite boring. Also make sure you are staying in the frame with your hands, you went off camera a few times
Hop I could help
regards,
Joeyfx