Upgrading factory-turbocharged car

I’ve done research on how off you want to add a turbo to your car you need a downpipe, fuel injectors, tune, intake, this that and that. If my car is already turbocharged what all do I need and get.

I have a 2012 Volkswagen cc 2.0T, and I want to get some power but not necessarily over the top. I’m not trying to compete with beamers or anything but I want to feel something when I floor it. So what do I do and need. And what are some parts yall know that I can use.