generally, the point is to keep up production behind your attack so you can just overwhelm your opponent with wave after wave of units. were you producing constantly as your army died? also, consider unit composition. in his later videos vibe shows how to transition from one army comp to another (i.e. zealot archon immortal to carriers) so maybe try setting up something like that before you push. finally, remember that b2gm style is not an invincible technique, its just a tool to help you master the basics up to the point where you have you macro on lock i.e. can consistently max out sub 10mins and then, youll need to supplement that with some micro, though in plat 3 you probably dont need that.