set (one's) sights high
To have very high expectations or ambitions. You have to set your sights high if you want to have a fulfilling life. We had a really great year for sales; now let's set our sights even higher!
set your sights ˈhigh/ˈlow
be ambitious/not ambitious; expect a lot/little from your life: If you set your sights high, you could do anything.