transferring into Vanderbilt

I have always wanted to go to Vanderbilt but was rejected as a senior in high school. Now I am unhappy and want to transfer but I want to know what my chances of getting into Vanderbilt are this time around.

I am a first year student at a very academically rigorous four year college
I am on the varsity swim team
ACT: 30
High school GPA: 4.1/4.0
First semester GPA: 3.3/4.0

What is the percentage of transfer applicants who are accepted?

According to college board, Vanderbilt accepts 30% of transfers that apply.