This is really good for your first track.
The first part of you remix doen't have many issues. I do not know how much you did by your self there, but if you sampled it on your own, then you did a good job.
Your drop seems to have more issues.
You should work on your volume level: the bass is too loud and the drums too quiet. Also you should work with compression and sidechain the your bass to the kick.
This should do a good mprovement in quality. But for your first track it's fine, just continue producing and your get automatically better.