Need advice from lead trumpets in Marching Band

So this year is my senior year and the show has blessed me with a particular large amount of solos a trio and some trumpet features as well as a good about of screamer notes. Ive played 1st trumpet for a few years and playing that high up has allways been pretty easy for me its just the lips get pretty tired twoards the end of the show and I need advice from a trumpet player who has done what im doing this year and plays at my level.