What pitch should i add?

Another question, how old are you? If you are in your teenage years like 16-19, your repertoire is fine for now (4-seam, knuckle, curve, and change). I think a safe bet for an additional pitch is the 2 seam fastball. Most people call it a sinker because it does sink down towards the plate. It does not add any extra stress into your pitching motion and all you have to do is throw a "fastball" arm - in other words, no twisting of a curve, just throw it hard! Since you are a lefty, the movement of the ball may be different. It may tail either inward or away for a righty, while going downward, which is nasty. I have a pitcher who lets it sail and it sinks down while tailing away from a righty batter. So if it ends up like that, try to throw it up and in with a righty and bang strike three.

Don't add a slider, splitter, or any other funky pitches because it can wreck your arm. If you really want to be a better pitcher, develop your fastball and location. That's all I can say as a baseball coach!

Good luck in the season!

you have some pretty good pitches, you can go with the fastball, then knuckle then fastball again ot knuckle again, or on 0-2 you can go with a curve that breaks out of the zone. You could try to add a slider, a slider after a big hook, will have the batter all confused!

As a lefty myself,

A two seam fast ball would greatly improve on K/9 as it has velocity as well as a tailing movement. It will move away from leftys making it a good start on the plate -break out side strike out pitch.. It could also be used as a backdoor pitch againts righties.

You should definately add a slider as it will help your knuckle curveball seem to break harder, and your fastball to seem faster.

yeah age is huge. if you're young, 3 pitches is fine. if you're older, college-on, then add a sinker or sinking 2 seam fastball. you will need some groundouts to make for easier innings.

Yo ok. I always throw what is called the "football pitch." You put you middle finger on the seam, don't hold the ball with your pointer, and throw it exactly like a football. It has wicked movement if you throw it rite.

Try a Forkball/Splitter not many people throw it. Just plave the ball between your pointer and middle finger and let it roll off your finger. It will look similar to your change-up but will have more movement which will confuse the hitters.

Either a sinker or a slider.

u shold try a slider

Eephus!!!!