reach for the stars
US /riːtʃ fɔːr ðə stɑːrz/
UK /riːtʃ fɔːr ðə stɑːrz/

1.
to aim high or to have ambitious goals
:
•
She always told her children to reach for the stars and never give up on their dreams.
•
It's good to reach for the stars, but also be realistic about what you can achieve.