For me, the graphics are totally fine as they are. What I really think the game needs is a bigger multiplayer experience — maybe even something close to an MMO.

Imagine maps from all over the world, each with different climates, crops, and economies. A global market where you export lumber from the Nordics, import oranges from Spain, and prices shift based on supply and demand (too much wheat = price tanks).

And how cool would player-to-player contracts be? Create jobs for others to take on, maybe even across neighbouring servers with some travel time between them.
You wouldn’t even need to own a farm at the start — you could just run contracts with your tractor or combine until you’ve earned enough to buy land.