Utilize the free space that's available on top of the countertop display cases, with the help of a bunch of plastic sign holders and catchy phrases ^{[one in each and don't overdo it (main focus should be on why you accept BTCitcoin, as opposed to a BTCitcoin accepted sign)]}.

• In addition to @Lucius's suggestion about having a color, don't slap the whole print on the glass door ^{[trim the excess to make it look like a sticker]}.

If you're referring to the image that's on the bottom right corner, then it doesn't look good!
^{- You have to do a lot better than a partial BTCitcoin logo that's buried beneath other images.}

Can we see how it looks?

If you had a website, I would've suggested listing it on various crypto directories.