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.

I don't see any Magic plugin in the marketplace

It would be great if we have chatbot plugin to integrate the live chat on the website

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

Based on underlying data & image. Auto generate a poster on demand basis a template like in canva

Elastic search

It would be nice to integrate algolia search into strapi EASILY without hassle. I'm currently using mattie bundle strapi plugin which is fine, but there are lot of bugs in there. I think that lot of people would like it if you added this plugin into strapi.