I am an 18 year old left-handed college freshman who throws low to mid 80s and I'm trying out for my DIII team. I threw a four-seam, curve, change, slider, and forkball my senior year in high school, and I had decent accuracy with all of them. Now, I'm thinking about changing my selection to something that could retire college hitters and I've been wondering what 4 or 5 pitches I should throw out of the 8 I can put in the zone that would make me a more efficient pitcher in college.
4-seam, 2-seam, sinker, curve, change, slider, splitter, forkball.
Whether or not I should make a change, any input is appreciated.