Improve Instagram account of existing shop

A small café opened few months ago with Basic Instagram. The café owners have the branding ready. The would like to improve the social media account and have a theme for summer and winter campaigns. This includes some templates for Instagram posts and stories. In addition to have some designs for the posters to be printed outside the shop. Most of ideas and branding are available, but we need creative designers with social media experience to improve the account and give other ideas for future.