Workouts at home

Hi all. Looking to do an Olympic may 2027, and build up to a half in october 2027. I have many years of swimming and cycling, running has always been my weakest but that's more mental than physical. My predicament is I will have to do the majority of my training at home. Bike trainer and treadmill , and can go to the pool 3x a week. Aside from it being mind numbing , I need the race focus to train. Have any of you done a race with the majority of your training being done at home?