Huh, if you don’t want a plan, how do you plan? If you don’t want a plan, which I assume you mean a structured TrainerRoad plan, then you can do whatever you want and looks interesting that day. However, know that your potential fitness is likely to be lower than what you could have achieved in a periodized structured TR plan progression. There is quite a bit that goes into the plan progression, workouts, interval structure, rest and TSS ramp rates. That would be pretty difficult to structure for yourself without some significant knowledge and experience doing so. You are far more likely to get it wrong than right and be disappointed that you’re not achieving expected fitness goals.
However, if you want to plan a no plan, then pick whatever workouts look interesting for the day. I would add in at minimum of two days of rest and no more than three high intensity workouts per week.