Beware: My opinion is unproffessional and you can feel free to disagree with me.
From what I can hear, there is a lot of good stuff going on here. The main body of the song is good, but gets a little repetitive. Copy+Pasting parts all over the place in a song does make it longer, but there are some sections in your piece that repeat that I think could be made to sound more fresh with only a little bit of rearranging. from the beginning to about 1:53 is probably the most obvious repetition. Some of the parts here are definitely playing similar lines multiple times, but have you considered giving the bassline temporarily to the higher instruments? Trading parts around like that is a great arranging technique, and leads to some interesting melodic variations. Another way to freshen parts of your song is to temporarily change key. Most typical changes are going up a fifth, a second, or fourth, but any key is available, if you can make it sound right. Transitions are the most difficult part of this, but it's great for endings and middle sections. Lastly, rhythms are fun to vary, especially with percussion. Trying different drumbeats with the same melody can completely change the atmosphere of a piece. changing it mid-song can sound really effective when done right.
Overall, experimenting without having any clue what you're doing is a great way to learn what you're doing, and since it's your music, you're free to push any limits you want