Strike it clean under pressure. Judge the bounce, get the body over it, and hit the half-volley quickly and cleanly before the defender blocks.
As the base, but a defender closes the striker. Emphasise judging the bounce, a quick clean strike before the block, and composure. Start the defender a step back, then closer. Rotate the roles.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.