I've mastered every kind of br instrument. What's next?

I can play trumpet, fluglehorn, bugle, coronet, French horn, mellophone, sousaphone, German tuba, four-key tuba, tuba, 3/4 tuba, baritone B.C., baritone T.C., marching baritone, trombone, tenor trombone, b trombone, and valve trombone. What instrument do I learn next. I thought about flute, but I can't get any noise to come out. Suggestions?