Holistic review does not mean that recent college grades/GPA will be disregarded. For junior transfers, college grades/GPA will be the most important factor, holistic or not.
If your overall college GPA (including the 4.0 in your community college courses taken while in high school) is more like 3.7, that is better than 3.45, but holistic reviewers will see a downward trend, and 3.7 is still below the average transfer admit GPA that Brown posts.