When I used to practice ADA, I used to do it the same way you're doing it. I would stop what I was doing and try focus on everything, like see everything that's in my field of vision and notice the little things, e.g. the shadows of certain objects or the pattern of the carpet. I would also try to engage all my other senses. So, if I was sitting down I would notice how the sofa cushion beneath me feels and notice how I breathe.

I suggest that you keep at it and eventually you'll start seeing results. Heck, if you believe fully in your abilities you could see results straight away! Hope this helped