So here's my story.
After ruining my trumpet chops during last years marching band season, I decided to switch to euphonium for concert season and take a break for trumpet. Currently, Euphonium is my primary instrument for concert band. I've been playing trombone for about 4 or 5 months on the side now and have currently joined jazz band as a trombonist. Only at home have I been lightly practicing trumpet, with a lot of long tones and lip slur exercises.
I want to continue playing music after high school for a hobby. I don't plan on a career in music, but I would like to play for jazz bands or orchestras. The problem is, I seem sort of confused on which instrument I should pursue. I know there aren't many opportunities to play euphonium in an orchestra or in a jazz band.
My current plan seems to be doubling on both trombone and trumpet, but I'm not sure if this is a good idea and I have no idea if I play well enough to even play in a band as a hobby.
I guess I'm asking two things.
1) Should I double on trumpet and trombone?
2) What would be the best route for me if I wanted to continue playing as a hobby?
Also, are there any exercises that help with doubling?