If the black king doesn't accept, then you play the basic mainline again.
I made this as an analysis because I'm explaining this. Please do NOT look at this until you finish the puzzle.
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Jul 25, 2021
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#3
This makes the king stuck and have nothing to defend this with, so you can castle and slowly take the 2 rooks and 1 bishop into the attack.
The Standard Bishop Sacrifice
This pattern is called the "Greek Gift" sacrifice. Also, the declined diagram "mainline" is suboptimal. 1. Bxh7+ Kh8 2. Ng5! anyway!
The threat is Qh5 and a discovered attack by removing the Bishop, so Black needs to prevent Qh5 from coming. If 2. Ng5! is met with 2...g6, then 3. Qf3 and White can make gains on the positional point of Black's weakened dark-squares near their King.