See opportunities and forget the limitations! A stonemason has to chip away many small splinters from a rock before the statue takes shape. It’s the same in mathematics.
The easiest way to see the opportunities is returning to theory. This includes focusing on the rules, formulas and methods you already know. This might be the where your challenges originate: Do you know the rules, formulas and the methods you are supposed to know?
It is hard to see opportunities without the proper tools. You might want to return to the basics and ensure you master them. Once you’ve acquired enough tools, try to apply them to solve the problem at hand.