Hi Georgia, and welcome to the club.
I have never come across so many faults on a diesel engine. I have had my s type with a 2.7 litre diesel engine for 7 years and never had a DPF problem.
I always use premium fuel and use an additive [Millers Eco Plus Diesel] which keeps the EGR valves clean and keeps the exhaust system clean. I have been retired for 21 years and no longer do the mileage that I used to, but I do try to give my car a good run once a month [Covid 19 doesn't help]. My car has done 85,000 miles.
I have the feeling that there is something wrong that should have been discovered and it could be worth a letter to Jaguar. You are doing nothing wrong with your driving and I feel that Jaguar should do something.
Let us know how you get on.
Regards,
Peter.