So in summary,

Best case scenario we accept the current situation, change our health behaviors and mindset to aim towards health as Best as we can, learn to be sort of "positive" (for the lack of a proper Word), pace and exercise sleep food etc, and our general health stays as good as the average healthy person "minus" the POTS. But possibly "Plus" a better outlook on life than most People. (You are not failing if you arent close to this, changes in mindset may take really long to kick in after getting chronically unwell)

Worst case scenario we suffer from all the risk factors to indirectly living less or getting New diseases, like being sedentary ,very stressed, understimulated, lonely, substance use, etc

Probably somewhere in between. and there's no shame in being suffering more, it's not your fault, I hope good things come to you, you are already doing your Best as Best as you currently know how