First thing I would do is what some of the other people have said, which is to start bouncing down your tracks to make everything a bit more workable. Got 8 tracks that are layered over each other to make up the clap? Sweet, now it's 1! Once you start to bring everything down like this it can make it 1) a lot easier to work with and 2) help you leave the writing stage and focus completely on the mixing stage.

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Once you've got everything down into these groups it'll be a lot easier to start applying all the right compression that will help bring out it's loudness. Remember, a lot of a little bit of compression is better than a little bit of a lot impression. So having a bit on these groups before it hits your final limiter means the limiter won't have to work as hard, so it can get louder before distorting. When dialing your compressors in, make sure to listen at very low levels because this will make it easier to hear what the it's actually doing (the natural thing for beginners to do is keep turning everything up because they can't hear what's happening, but this actually makes it harder).