Well since it’s almost fall, you could do some simple leggings or a skirt, and taller shoes. I would personally not do patterned leggings just because of the patterned sweater, but do whatever makes you feel like ‘you’. If you do a skirt or shorts, I would do some dark tights (maybe some skeleton tights or striped tights or something). I only push taller shoes - platforms or heels - because they make the outfit a little more interesting, but I also think studded pointed-toed flats or ‘poofy’ sneakers would look nice.
It would also spruce up the sweater a little bit to add a collared shirt underneath, or to buy a detachable collar (like one of these), and then layer a long necklace underneath that. As for the rest, it all depends on how you like to style yourself! I would personally do big earrings, a big statement ring (like this one), and if I were wearing tights/skirt, I would layer some ruffly ankle socks over the tights.
But really, there are a ton of things you could do, so try out a few different outfits with the same base ´ ▽ ` )ﾉ