Ok I can understand not wanting to use cheats. I don't like using them either for the most part unless something is not going as it ought to like a stuck milestone. I prefer to do them as was intended. But just so you know, there is no penalty to using one on PC or Mac like there is on the console versions of the game. The milestone will simply complete and in your case with it being the last milestone to complete, so will the aspiration. Your sim will get the reward trait just as if you completed the aspiration through game play. I've had to do it several times in my main save to deal with a similar thing in various aspirations and have seen no downside to doing it when I've had to.
Hope this helps.
@Rain-of-Dawn96 This looks like it will get moved to General Discussion if it is about gameplay only. But just to make sure, have you looked in the bug section to see if there is any reports of the issue? I found this, that needs input, that is, more players to add their experience of the issue:
https://answers.ea.com/t5/Bug-Reports/NEEDS-INPUT-V-Musical-Genius-Mentoring-in-Music-Not-Fulfilling/m-p/9283391
Here are the cheats sanctioned by EA, I got it when I asked an EA representative if cheating was safe to do in the game:
https://www.ea.com/games/the-sims/the-sims-4/pc/how-to-cheat
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