Your most advanced knight is on a light square, as are Black’s king and queen; there is a potential fork at e7. Ask if the square is safe, and see that it is guarded by the bishop at d6. Now look for pieces you can use to attack the bishop and notice the queen at d1―but also the knight at c4. It is important to notice both. The question is not “do you have a piece attacking X?” It’s “how many of your pieces—plural—attack X?” You don't want to sacrifice your queen when a knight will do, especially as it would make the sequence a wash. Correct is 1. NxB; c7xN; 2. Ne7+.