When I started with Sequelize, my organization required their service's backend to be very modular & structured.

https://huzzaifaasim.medium.com/sequelize-getting-started-configuring-sequelize-orm-with-node-js-79e1206cbc4a

Check out this blog as well, that configures Sequelize with your Node Js environment in a structured and modular way for ease in maintainability.