This is not financial advice, I am not an advisor.
US folks, if you're cutting back your purchases, consider you are voting with your dollar wherever you contribute your retirement (401K, IRA, HSA, etc) contributions as well. Most places have few offerings, but it's worth looking if there are foreign investment offerings at your provider. At least for me there was a foreign index fund.
Continuing to invest in the US stock market will continue to show some amount of faith in its performance. Invest your money elsewhere if you can.
Hopefully this is allowed... I've seen lots of folks saying to drop paying for subscriptions, buy local (instead of big corporations), and to buy European if possible (or at least non-US). I think this fits that bill, but delete this if not.
"Rendering my cash invalid with no recourse" might be on the extreme end of this, if the places that its checked are ATM and banks - so long as it's still exchangeable for goods/services (e.g. not being checked by stores)
I'll keep an eye out for kore info though.
But yes, with serials are tracked when taken from/put in ATM/bank, it is not anonymous. Potentially breaking larger bills at common places (stores/gas stations) could mitigate this, but theres still information about where you've been inherent in that.