Well
I hate to give you such a low score, but I'll tell you why this isn't to my liking.
I'm sure this sounds great in person, but the recording is pretty flawed. It sounds muffled for the most part and I can hear a lot of crackling. I'm not sure if it was intentional, but there's a strange panning going from channel to channel and it sounds really out of place for something like this. It wouldn't suit something like a trumpet recording at all, which, in my opinion you would want to be as crisp and clear as possible I would imagine.
I played the trumpet for a few years, as does my grandpa, and it sounds like you know what you're doing. The trumpet playing itself isn't the issue at all - I seriously think you need to invest in a different recording medium. Now back in the day when I recorded guitar tracks, I used a shitty mic and windows sound recorder and it sounded a lot like this, although I've since changed and started doing electronic music instead - thus - I have no recording advice for you...
Overall what I'm trying to say is that I'm not insulting you as a musician, but I'm not really sure what advice to give you either. I'm not sure what the best way to record a trumpet would be really, but whatever microphone you've got doesn't seem able to handle it. I'd consider buying another one if you'd really like to clean this up and continue to reach out to others with your music. A crisp and clean version of this would be fantastic.
I noticed the mild echo you put in, and it sounded good with the recording. It was just so muffled, crackled, and panning left to right so much that it was almost impossible to enjoy as it stands.
Keep at it though, and I hope I'm not coming across in any way as insulting. I'm just being honest with you as to why I did not enjoy this much and trying to give you as much constructive criticism as possible.