2 year Ironman training plan

Hey everyone!

Just completed my first triathlon at the Wilmington 70.3 Ironman. Was able to smash my goal with a finish time of 5:13. Never had experience in the three disciplines besides a year of xc I did in high school about 7 years ago. I trained for this event for 6 months and thoroughly enjoyed the process. I’m taking a few months off from any regiment. But I have a goal of completing the full Ironman event in 2027. I will be starting grad school in January and just want to get an idea of how to train without having an exact race planned out. I’ve thought about training for a marathon next year but don’t want to lose fitness in the other two disciplines. I do enjoy having a day to day routine in which I am striving for a goal. Any ideas how to structure 2 years of training? I would love to hit sub 11 - maybe faster depending on the course. Thanks !