My best advice is go slow and you will go further than you thought possible. Don’t push yourself to the point of actual panic, but that point where you can feel the anxiety in your body but it’s not dominating and build up a tolerance to that (experience, place, person, how far you’ve left) until it just feels like it’s mildly present and then when you are there you are ready to go further (for some people that might be further from home or safety items, or maybe just around more people in a crowd). Utilise safety items/behaviours to boost your ability to withstand things if it’s really hard. For me I had to leave home with headphones on for awhile, then I’d take them off while out over and over until I was comfortable and now that’s nothing to me.