Well, there's some odd things going on.

First of all, the drums that you chose weren't that great. The kick and snare were lacking high end. You can use a multiband compressor for the kick and snare, but I'd recommend using custom settings for the kick and just an OTT for the snare and some high end EQ. There's some other junk that you can do, but that's the basics of un-crappifying drums in my experience.

On the subject of drums, this song is lacking in hats... there's a bunch of good free ones out there from Cymatics, Antidote Audio, and from the Kozmoz 3k Follower Drum Pack on youtube. They all have great, all-purpose hats. (If you stumble upon Ghosthack, their dubstep stuff isn't good. I'd go to them for foleys, though.) Anyways, I'm pointing out hats specifically because if you had hats in here, this would sound much less empty. If they sound odd at first, just know that they'll work great when you have everything else in place.

Moving on - the buildups weren't very attention-grabbing, and the drops weren't very attention-keeping. This will get better overtime, but you need to know that it's a problem. If you keep making songs, it'll eventually fix itself (and you'll begin to make music that you actually start liking). The only helpful things that I can tell you are that you always make the drop first, and then you always change the buildup if you don't like it for some reason.

Actually, about making the drop first - always do that to start off a song. Usually I just make the first drop first, and then duplicate it and make modifications for the second drop. I suppose you could also make multiple drops with similar styles, and then call the most energetic drop the final drop and then choose the first drop(s) however you want. (I worded it like that because you might want to try making a 3 drop song sometime.)

Finally - the trumpet lead. It has its place, but that place is not the spotlight of a song, unless it's a meme song, I suppose. But in a more official song, choose your lead more wisely. And if you really can't think of anything, just use a supersaw. It's such a common sound that nobody will raise an eyebrow.

So yeah. Some problems, but don't be discouraged.