The four themes
Freshman year — Build the base. Nothing you do this year will win an award, and that is not the point. Freshman year sets the GPA everything else is measured against and the course path that decides what you're allowed to take later.
Sophomore year — Go deeper. This is the year breadth stops paying. Two commitments you've held for years read as a person; six you joined last term read as a list.
Junior year — Make the case. The year admissions readers look at hardest, and the last full year of grades most colleges will ever see. Everything from the first two years either becomes evidence now or doesn't.
Senior year — Land it. Execution, and it is shorter than you think. The roadmap ends after third quarter — by then everything is submitted and the work left is deciding.