Long tone practice is crucial, regardless of your current proficiency level. You really want to push the clarinet to its softest and loudest dynamics across the entire range. I use the phrase “cuuutiie” to help set up my embouchure. I would strongly recommend taking a lesson with someone, specifically with the goal of improving breath support and initial articulation. Regardless of whether or not you take lessons, record yourself practicing every day and listen back with the goal of changing one thing at a time. To take it a step further, start listening to high-level clarinet recordings. I find it comparable to a race track event where you sit in the passenger seat with a much more experienced driver to better understand where you can improve your lap times. You need the actual experience of watching and listening to clarinetists perform at a much higher level so you can identify specific aspects to improve in your own playing. As for the mouthpiece, you can try the link below or ask about it during a lesson. Regardless of which advice you take, reflect on everything you do. Drawing from the car example, think about your other learning experiences in life. You did not learn how to read and write alone in a vacuum. You were given tips and tricks along the way that improved the learning experience. The same approach applies here. If you're a self learner pick up this book. https://www.amazon.com/Educators-Guide-Clarinet-Thomas-Ridenour/dp/0971797900 Mouthpieces article https://clarinetnotestudio.com/2023/08/04/best-clarinet-mouthpieces-for-beginning-to-advanced-players/
