Here is a serious answer. As cars age, their value goes down. You never get the value back. You might put a couple thousand in wheels and a body kit. That doesn't mean it will sell for a couple thousand more.
I've seen many many cars that are highly modified. The owners put major $$$$ into them. They sell for cheap in part because no one wants to buy a modified car. By putting 19" rims on it you have pretty much eliminated most of your potential buyers. Grandma and that conservative lady down the street have no use for a car with 19" rims and a body kit. Even if it looks hella flush.
Relax, take a deep breath. Never look at a car as an investment unless it is super rare. An altima is not rare. They are a dime a dozen.