Just start. People think they have to do 50 new lifestyle behaviors. Just one is solid.
As people get some steam rolling, they still believe they must need the 50 item checklist. You don’t. You don’t want it. You don’t need it.
Modern humanity has created a litany of impossible requirements for itself. One is being a perfectionist and multi-tasker. Neither one is a real thing or possible; they're mutually exclusive; but we definitely try to do both in our minds, and end up being neither in our deeds. In the fitness world as well, the centerpiece of CrossFit has generally been "work out as hard as possible for as long as possible." Again, these are mutually exclusive. In exercise physiology, there is EITHER maximal intensity for as short a time as possible OR maximal duration for as little intensity as possible. These are quantifiable places on a spectrum of human performance. Likewise, we want to start AND rock out a 50 item list. No. These too are mutually exclusive. Even entertaining the "clean up every area of my life" concept itself negates starting.
Be realistic. You aren’t going to eat 42 egg whites and a pound of spinach (and nothing else) a day every single day for 4 months, fasted cardio every single morning for 4 months, and the same 5 workouts each week every week for 4 months (I’ve done EXACTLY this before). And even if you do, then what?
Just start. Get strong. Stop shooting yourself in the feet. Be realistic.