You can use your idle time to promote your business. Every successful business owner is doing that.
Make an offer your customers will not refuse.
Test your customers' response to your offer and determine which message is more effective before investing hundreds of cedis printing hard copies.
Learn, adjust and progessively enhance Step 1 and Step 2 by continuously sharing your business link(s) on social media, collecting and analysing response/ feedback from customers and grow your business.