I have not got my atar so I don't know whether my opinion would matter here or not.
Having a high atar is only worth it if the course you want to get into requires it.
What degree/course do you want to get into
hsc, high school and all that wont matter to anyone in ten years, it effectively has no value.
You could be dux of Knox Grammer school with a 99.95 atar and in 10 years it wont matter
Become a moderator, how did the great @jimmysmith560, hmm? Skilled he must be, wise and trusted by many, yes. Earned his place, he has, through dedication and strength of character
u speak to much like a bot tho ... in the sense that everything u say it perfect, like I said perfect grammar, perfect punctuation, perfect sentence strucutre