I have read that skilled mindfulness practitioners maintain constant awareness of their breathing pattern throughout all other waking activities. Something to aspire to perhaps.
There's also a level above that, where you're aware of what is aware. I find this mental state to be even more calming/grounding than being aware of breathing but I'm not always able to shift myself into it. Being aware of breathing feels much easier/natural to me whenever I'm able to remind myself of it, which already provides quite a noticeable effect on how I'm feeling and reacting to whatever is happening in that moment.
Additionally, there's a practice called "walking meditation" [0] that can also be useful to practice this area of skills.
I think it is helpful to practice autonomic control throughout the day. If you are riding the bus or sitting in a circle or doing this or that and you have the spare bandwidth to think about it. It becomes a habit.
People don’t like anxious people so it is part of charisma development like you do training for spiritual leadership or relational healing. Less anxiety means more tolerance for risk, ambiguity, etc. it is not “put it all on 7“