Your card company is not responsible for marketing the cards you sell. That is your job. It is essential you promote your range of cards outside your business.
Promoting cards outside your business is easy and rewarding. You can attract new customers and get existing customers buying more cards.
Very few newsagents promote greeting cards outside their business. While, selfishly, this suits me, it hurts the disengaged businesses.
Use social media to talk about cards. Do this every couple of days. But be smart, focus on a card you like, include a photo, use the card to shine a light on your point of difference.
Your major competitors will not do this. This is why I say it is an excellent opportunity.