If it’s very streetable, and you’re happy with how it runs now, leave it alone. You aren’t going to pick up .5 second at your level with just a cam swap. The decision NOT to run nitrous doesn’t change what the cam does in the engine, every cam is a nitrous cam, and therefore every cam is not a nitrous cam. There’s not much to gain unless you make a very large change in camshaft. Leave it alone, go drive it.