Should I buy a larger house that is 3000sf or stay in my 2400 sf?

I LIVE IN A GOOD SCHOOL DISTRICT, BUT THE ATHLECTIC DEPT STINKS. I LOVE THE LOCATION OF MY HOUSE BUT WOULD LIKE A LARGER WALK IN CLOSET AND LARGER MASTER BATH AND AND ENCLOSED GARAGE. I LIVED IN MY HOUSE 15 YRS. MY CHILDREN AGES ARE 17 16 AND 6. and my neighbors are very nice.