It depends on the nature of your business but I believe that the best way is a combination of originality and relevant information: i.e. sms, email marketing or bespoke offers if you have in-store wi-fi 75% of shoppers use their mobile devices in-store (Internet Retailer).
Have a look at selfservice.marketing if you want to have an idea of the most effective marketing services that you can use. I hope it helps!
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I didn't find the right solution from the internet.