bar out your intro to something that's like 16 bars long, go to silence at the end of the 16th bar and then bring on the trap beat.
you have enough music and instrumentation to use for the main drop, you just gotta arrange it a bit differently. the arrangement can borrow a similar chord progression or use the same one.
add in sounds from the intro drop out sounds from the intro, maybe make some new ones.
But use with what you have and just throw in a phat beat and some bass.