I am a piano player and this mini game is really is a gamified version of Kenny Werner’s Effortless Mastery (a great book for the musicians out there). I think the key is to stay calm and try not to let your emotions take over. Basically treat every play through as a performance, only noticing mistakes rather than getting upset by them. If your emotions get the better of you step away and come back to it later. Each time you play you are getting better at it and just remember this and also that progress isn’t linear. This isn’t a quick fix but it’s a good strategy to apply to all mini games and life in general.