One other thing...
Don't discount the idea that if you are recording in your bedroom or basement there will likely be a lot of low frequency resonance in the room... it can sound muddy and dull just because the room is full of to much bass.
The point being, try what seems like an aggressive low cut and listen to see if, as you sweep up the frequency range and cut more and more lows, that the trumpet seems brighter simply by removing the low end resonance of the room.
I point this out because you may find, without the low cut, that stuff actually sounds swamped with bass while you are interpreting it as not bright enough.
Some may explain that the easiest way to reduce the capture of unwanted low frequency room resonance is to use a very close mic position.
That is true, but as you move a cardioid mic towards the primary sound source you will boost bass response as proximity effect.
Either way you may have a whole bunch of low frequency energy that isn't helpful.
So, consider a low cut and try it a little more aggressively than you might think is ok. Give it a try. See if it helps get you what you want to hear.
best regards,
mike