How do I deploy my app built with Node.js and Nextjs. I use Express.js but I dont mind changing it if there is a workarounf

I built an app with Node.js & express as backend and Next.js as frontend and I also use concurrently to connect both. Now I’m done with building and I need to deploy the app, I have found not source on how to deploy this. Pls how can I deploy this on heroku or any other source. I’m finding it tough to do this. Thanks.