You need to 'kick the ball to the middle'. If you are applying insufficient rudder the needle is to the left and the ball is to the left so you need to apply more rudder.

Left turn, ball right means you are applying too much rudder ('kicking the ball too hard').

When the ball is inside on the same side of the needle, it is said to be SLIPPING (CORRECT). in this case there is TOO MUCH BANK... the ball is falling inside the turn....

When the ball is outside on the other side of which the needle is pointing, the aircraft will be SKIDDING (CORRECT) which means there's NOT ENOUGH BANK (think and see what happen on the ground during taxiing. You’re turning but with NO BANK... the ball is on the other side of the needle)