I use aromatherapy. Put it on a charm and huff it every once and a while.
I keep crystal rocks on me for if I need to fidget, or to gaze focus.
I shuffle tarot cards. The sound of the bridge and the feeling of all the cards moving at once mmmph yes. You can use regular playing cards, smaller is my preference.
I listen to binaural beats very low with noise resistant ear buds or headphones.