The truth about mastering an instrument that no one wants to talk about is you need discipline. Motivation is unreliable and fleeting. You have to play whether you feel like it or not. It's also tedious. People think musicians just have it. Nope. They spend thousands of hours of repetition. It's not always fun. If you need it to be fun, you won't progress much. Another component, the better you get, the harder it is to improve. And the better you get, the longer it takes to improve. Ive taught music professionally my whole adult life. There is a myth of talent. Yes, some people are more naturally inclined than others. But often those are the hardest students to teach and they often improve the least. My students who soar are the ones who put their head down and do the work whether its fun or not.