I have tried to display a reminder of accepting cryptocurrency payments in my shop.
But many customers don't know what cryptocurrency is.
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Finally, I removed the cryptocurrency payment method.
Depending on your shop's location, it might work to promote it online. There are several websites that show local shops that accept Bitcoin on a map. If there's a popular site that covers your location, new customers will find you because you accept crypto, instead of trying to "convert" existing customers.