Thanks for the detailed review.
I agree the end of the track could be improved and adding another part to bring diversity would definitely help.
About creating my own sounds, you're completely right. I thought about it when I was composing, but the issue is I don't really know how to proceed (for now).
I was a bit frustrated because I was limited by the samples from my libraries and I felt they sounded too similar. I did transform them but still they are recognizable.
No worries about your suggestions, on the contrary, the point of participating in these jams is to practice and get feedback, so thanks again :)