Add some other patterns especially to that bass. Breakdown the song and slow it down somewhere in the middle... Leave the bass on the first note of the phrase only (or at least use it less) and play with the drums and build it up back. Stuff like that... Change the patterns to create different song parts. Could also change an instrument if you think you can find something that fits (but don't forget to change the pattern too... just the instrument isn't enough usually).
EDIT: Nevermind this next part... I heard an awesome transition somewhere around 1:24 in your track... Awesome job!
Keep in mind that it's a good idea to also create a transition between two different parts of the track. This might be as simple as just muting the drums on the last 2 phrases or just muting everything somewhere in the last phrase (after one of the snares) and then just jump into the new stuff.
Yeah, I guess putting a higher octave bass note at the end to the track does take some of the dynamics out. I guess I could also switch up the instruments. I keep forgetting you can make multiple instruments and use different ones in the tracks (I think since I rarely finish songs I don't intuitively think of that stuff). And you're right, the patterns don't change up enough.
Thanks! 
