I would not worry about the questions of “what do you want as an improvement”. Often, you just don’t know… but have been greatly rewarded in the past. This is not a question that is really appropriate to anyone but highly experienced audiophiles.
For at least the first couple decades of my pursuit of the high end my investments were on faith that I could do better. After fifty years, I know with absolute certainty that if I double the investment in any component or my whole system will very significantly improve it. Although, at this point, I could survey the possible components and articulate how it would improve my system.