I dont wanna open the eternal debate of real instruments vs electronic music debate, but thats probably a starting point. If you just made some edm beats and chiptune, its easy to not develop " a style" because those genres (if chiptune was a genre) are kinda "soulless" by default. Im not saying edm sucks or anything , but if you put some of it into chiptune its just gonna sound "dance chip" like everything does. The most stylistic chiptuners out there come from different backgrounds and blend them into chip, they use their roots as inspiration for the small details, some write their leads like a gliding metal guitar, some write their drums like rock and roll, some made their basses like rap, some use jazz structure, etcetera. If you really wanna develop a style, it just comes by itself with time, you cant force it, but you can help it come sooner. Just open your eras, try different genres, learn a different instrument ( and translate chip into said instrument and viceversa), learn some musical theory ( and if you already know, learn some more) and at some point youll realize youre already there.
But obviously, if you just lay down 4x4 beats and stuff , its just gonna sound like that. Actually, every "good" musician on any genre is always A) a genius in its genre or B) a good mixer of influences
TLDR: make your sound richer by hearing and trying things different from what you already do/know