Then don’t start the process with VO2 max runs. Build to it. If you are not already walking daily, start there. And then progress. Think of it the way you would a barbell lift, your first day in the gym are you going to go for a 500 lbs squat or start with the bar?
If you are already walking, maybe light jogging (Just Run is an okay app, there are several Couch to 5K apps). Or jump rope.
Maybe, but I can’t help but notice this post,
How’s your mental health? How much are you obsessing right now? As you said, progress is progress, so if you are progressing then you don’t need any changes in stimulus unless you are bored and/or unmotivated. I’m all for building a conditioning base but start where you are at, not where you want to be. I’ve made that mistake myself plenty of times and it never ever pans out no matter how much you desire it.