A while back (like 20 years ago) I never had a problem with coins. For every cash purchase I made, I would make a point of getting out my coins first, and using those, and THEN the bills. I never ended up with too many coins, it's just a matter of getting rid of the coins you have, FIRST. A tiny bit of discipline. If they give you coins, they have to take them.

Now that I'm trying to use cash more, I'm doing the same. And it's not a problem.

I agree with the below poster. When you can't use lightning, use cash as much as possible.