You are doing great dude! If you feel that you play worse you can segment the parts of the etude into smaller phrases and try to play one part slowly until you get the hang on it. You should also try to sing what you need to play, you need to play the trumpet the same as you are singing it , maybe it sounds weird , but you can try to sing it with your voice and sing it how you would like the trumpet to sound like, for me this helps a lot when I think I don't make any progress, keep up the good work men! Hope my advice helps! You are doing great!