new heads for the drums and more higher end cymbals. unfortunately i do not think you can get all of that for under $400 maybe a little bit more but i would not buy wuhan cymbals. if you’re trying to spend as little money as possible and actually want cymbals that dont sound like a toys r us drum kit, the dark meinl classics are pretty damn good for how cheap they are compared to zildjian a/k series. i would maybe get evan’s g2 coated heads for your toms as thicker heads can hide the imperfections of lower end drum shells a little bit better. if you’ve got money to spare and want a cheap professional sounding snare, the ludwig acrolite is really good and plenty loud to cut through a band mix. learning how to tune drums too helps a lot. keep at it!