Mate this is quality. Not sure what you think is wrong with the mix but it sounds pretty good to me. I would make the release on that snare sidechain a bit quicker, but nothing else immediately jumps out as needing to be fixed.
Second drop-wise, I would keep it interesting by changing your chord progression at the breakdown, which you could do one of two ways:
1. Stick to just one chord, then bring your beats and bass back in. Then use simplified versions of your existing note patterns, but build up tension using modulation, effects etc., maybe bringing in a new element to use that free space you have in the high end (there are no prominent pad sounds in your tune yet, so that could be an option). Build all that towards a second breakdown, after which a third drop brings everything together.
2. Make your breakdown into a bridge using a different or modified chord sequence. Introduce something new that will complement what you already have going in the second drop, so that it flows nicely back into that while being more interesting.
Hope that makes sense. Cool tune!
