My parents in rural Washington pay $70/month for 10Mbps down. I’m not sure the ISP bothers with a cap.
I have CenturyLink 940/940 here in Seattle with no cap for $65. The alternative is Wave which has a cap and you have to deal with introductory price bullshit.
Because SQLite is slow as balls. Use MariaDB and redis:
https://markontech.com/posts/setup-nextcloud-with-redis-using-docker/