Google Cloud

With the service "Cloud Run" Google offers a convenient way to run your Next.js application as a Docker container.
Once you have your Google Cloud account set up, you can deploy your application via the Google Cloud CLI by running gcloud run deploy in your project directory.
Having a proper Docker setup is not required, but helps to reduce the size of the Docker image being generated.

Scalability included

When using Cloud Run you do not have to worry about the scaling of your service, since Google does that for you based on CPU utilization and number of concurrent requests handled per instance.
In the context of Next.js that does come with a caveat: you have to ensure the ISR cache is in sync between the Next.js instances running.

Redis with Cloud Run

The scaling of your Cloud Run service could result in your Next.js application running as multiple instances. To avoid displaying un-synced data states to your users you have to configure a custom cache handler.

The smallest Redis instance available with the Google Cloud is 1 GB. Which starts around 35$/month (depending on the region).
Just ensure that your Cloud Run service does have VPC access, to be able to access the Redis instance.

Pricing

Technically you could disable the Cloud Run auto scaling (so that you do not need the Redis instance) and enjoy the free tier when your are just starting with a new project.
Otherwise the approximate 35$/month are your starting point when hosting your Next.js application with Google Cloud Run.