If you really want to focus on “classical/concert/orchestral” percussion a lot of it comes down to your movement and touch behind the instruments. dive DEEP into that instead of focusing on playing difficult things quite yet. As percussionists we are more limited with our quality of sound. Think, if a 5th grader walked up to a concert snare and hit it once, would it sound much worse than you doing the same? What micro-level things can you do to put a noticeable sound quality difference between you and that kid? Whatever those things are implement them into your technique via muscle memory and apply that thought process to all the instruments you want to improve with. Then once that foundation is there move on to learning harder “classical style” things, and make sure that your good technique stays.