Ok, I’ve built the artillery cannon. What is my next best move?

You built it the wrong way, move the black king over so you can target him there

I analyzed the image and this is what I see. Open an appropriate link below and explore the position yourself or with the engine:

White to play: chess.com | lichess.org

Black to play: It is a stalemate - it is Black's turn, but Black has no legal moves and is not in check. In this case, the game is a draw. It is a critical rule to know for various endgame positions that helps one side hold a draw. You can find out more about Stalemate on Wikipedia.

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Release all batteries

You need to choose a king

Besiege Sevastopol

offer a draw? its aiming the wrong way