Great car! Congrats! Not sure what I could add that has not already been talked about on these forums quite a bit over the years. If it has had the "fix" done, you may elect to leave it be for now in case you need the generous warranty to fall back on. Your A4 car would also be a good thing to keep to fall back on too.
If you are not concerned with the warranty, it is up to you what you can or want to do, as well as any local laws that may make illegal modifications difficult or impossible to get away with.
Unfortunately the newer cleaner (yes, I said cleaner) cars are more fragile and have a lot more items that can go wrong. I would avoid driving the car hard during the warmup period, learn about DPF regen cycles and at least try to give the car every opportunity to run them. Avoid short trips if possible. The battery will have a shorter life than your previous car, partly because it is smaller yet has even more electronic loads to deal with, and partly because the underhood temps on the CR cars can get much, much higher. So be proactive about the battery. It hopefully has already been replaced at least once. If you live in an area that has rapid temp changes that drop just below freezing you may also want to read about the intercooler icing issue and proactively install a cold weather intercooler kit. Nobody wants bent rods.