Looking for a word/phrase that expresses you hit the pinnacle of your success early and it’s all downhill from there.
“Early bloomer” is the closest I can think of but that implies you learned fast and maintain your level of expertise.
Answer
flash in the pan TFD an idiom
Someone or something whose success or popularity is short-lived.
As in:
Or is it just another social media flash in the pan? BBC Feb 24, 2019
Attribution
Source : Link , Question Author : David Daudelin , Answer Author : lbf