I’ve used the rubber band trick and it works. I also count fast to myself 5,10,15,20,25,30 etc. But like you said we get too used to some techniques and need new ones. The one that works best for me just now is to read a list of positive one-liners over and over to myself.
Here is an example.
Rise Above The Drama
Look At Life From The Inside Out
Most Of What Seems Serious Isn't
Your Worst Battles Are With Yourself
The Best Guidelines Are In Your Head
You Are The Architect Of Your Own Life
Trust Your Bodies Ability To Heal Itself
Stay Strong And Stay Above The Battles
Away With Hang Ups And Half Measures
Continue To Carve Your Own Unique Path
Act As If You Are In Control Until You Are
You Have The Ability To Re-Shape Your Life
There Is Nothing But Thinking Makes It So
Take A Closer Look At How Things Really Are
Deal Positively With Unfamiliar Feelings