I’ve been away on a mini-vacation. I use Floating Toucher (which is like Assistive Touch but way better on minimizing battery drain). It adds something to notifications when you touch and hold the dot to make it disappear. It’s from that notifications that you can reactivate the dot. So check in notifications with Assistive Touch and it might be there as well. Give it a try, and do look into Floating Toucher, too.