Honestly, acting has helped me with this, therapy by exposure really pays off for agoraphobia - we used to have classes in large, tall, unfurnished rooms, with ash-grey padding on all of the walls (would've quit then and there were it not for the large windows...), about 6 hours per day. In the evening, full-on neon lighting. Also, the increased awareness of self gained through physical exercises and acting itself takes a lot of the edge off, for some reason. It helped me reach a point where I still feel the anxiety, I still feel my body going into prep mode, but I can push through it and everything subsides fairly quickly after that. Also went through a hefty amount of therapy to solve various childhood and contemporary traumas, which regained me my confidence.
Other than that, in more practical terms, I find grounding exercises help bring everything back into focus. I constantly listen to music when out and about, so I generally focus on that and try to get into the groove, just as yourself. Other than that, identifying random visual elements, feeling my body's movement, focusing on my steps, on my breathing, the whole kit and kaboodle. Mine mostly manifests through physiological reflexes, like a burst of adrenaline, senses going into hyperalertness, and also through paying a lot of attention specifically to what others are doing around me. When tired and unfocused, overthinking, catastrophising, intrusive thoughts, and even hypertension come into play, so I try to get my beauty sleep as much as possible. I think I understand what you mean about something feeling off about certain spaces/situations, although I've honestly never identified the cause beyond an acute awareness of being overexposed, even when standing in the middle of a room, and it makes me really jumpy - this I attenuate through a sort of mapping of my space, I try to visualise where everything is and focus on the physicality of the space itself. I do go through prolonged periods of self-isolation out of a feeling of fatigue from having to face the symptoms, although I enjoy solitude, so there's that.
My advice would be to not force it in unreasonable amounts, just like working out. Key is consistency, not volume, so keep safe spaces close and there is no abuse as long as you keep at it. I keep my space relatively cluttered, too - furniture or decorations/stuff, I think it has to do with visual noise in my case- to aid with this, I've also replaced all lighting with smart lights and I use those to hone in on a mood which feels relaxing in the moment. I also use my smartwatch to monitor my vitals just in case everything takes me by surprise, I've had sort-of "silent" full-blown anxiety attacks, in that my body and system go haywire, while my awareness has tunnel vision, so I'm not aware that my heart is pounding, stuff like that. Then, I go into grounding mode, breathing exercises are especially useful for the silent ones.
As a final note, I've found that several somewhat philosophical points have also affected my relationship with agoraphobia. I've learnt to appreciate the beauty of liminality, to the point where it turned into a minor fascination. Being aware of the universe's scale helps me detach through reduction of dimensions, stuff like that. These are shots in the dark, but hey! Ya' never know, brain's weird!:))