Try this: look for pieces that are defended by a single piece, and see if you can force that other piece away. Look for undefended pieces and ways to attack and capture them by attacking/threatening something else - a classic are two undefended projects that one piece can attack (fork).

Also check for "mating nets" where you can get a checkmate or threaten a mate. Often that can force a sacrifice.

Lastly, look for pawn promotions - they can be tricky puzzles but also occur in real matches.

Good luck!