lmao guys.
Playing different characters will give you experience with them, true, and teach you newer ways to think about the game, but what you've got to do in order to truly improve is practice.
Play each other whenever you can, when you can't, practice your technicals.
If you're on the boards, drop into a random character board and just read their main thread, learn every single trick that character has against you and other characters, and you'll finally learn EXACTLY how each character "works"
After this, watch videos. Try to pick up on people's tendencies, after enough doing this outside of a heated match, you'll learn to do it in match, against good opponents and you'll start to truly pick up, competitively.
It doesn't matter if there are 10 MKs in NJ Dylan, the only one that matters is Atomsk, as he's their top MK by a long shot. If you are truly motivated to pick up MK in order to prepare the rest of your scene for the character, that's all fine and dandy, just do your best. If you watch an M2K vid to try and understand what he does that's so successful, you've gotta remember that that's only how he plays against that specific character (prime example is his playstyle drastically changing between how he plays against Ally and ADHD).
Try, and you shall succeed