Pretty much a B average (high or mid depends on whether 90 is an A or 93 is.
Just asking how to improve chances hints you don’t have an idea. And you should have explored and seen that for OOS, the 75th percentile for ACT is 34. The 30 puts you at the top of the 25th percentile.
It’s holistic. If you don’t have a background (academic and ECs) in the major you note, how do you prove your strengths?