Mercadopago is the leading online payment processor for all of latinamerica. If you'd like to expand to the latinamerican market having an easy plugin experience would be ideal. They have a node sdk in NPM, called 'mercadopago' literally. it's official. Mercadopago is the official payment processor for mercadolibre a billion dollar amazonlike marketplace for latinamerica.
Live chat system
It would be great if we have chatbot plugin to integrate the live chat on the website
add to calendar buttons
Package this as a Strapi plugin https://www.npmjs.com/package/add-to-calendar-button
Commerce.js is a Headless E-Commerce solution ( https://commercejs.com ), such as Shopify doing a plugin could be interesting
poster auto generate
Based on underlying data & image. Auto generate a poster on demand basis a template like in canva