Find yourself some gamma radiation and you should be sorted with this.
ETA:
It’s still money. I saw a documentary that showed some treasury group putting money back together from fires and whatnot and giving people their money back if they could figure it out. So, while a hassle, you could still probably get your damaged money replaced. Try it with $1 first though…see what happens.
You could jam an expired credit card in there. Leave it for a few days. Then jam another in.
Gently springing open the metal clip may do the trick.
I’ve got a clip that was a gift from the LAPD after I trained some of their folks. Had it for more than 30 years. Periodically I need to squeeze the steel clip tighter, or it slides off of less than…about 5 folded over bills.
If you don’t have any old CCs, a small flat-head screwdriver works too. Slide it in there end-on, with the screwdriver blade point aimed towards the fold of the clip. Leave it awhile then shove it in a little farther.