I think the best wy is to host it on your own.
You can get a VPS for 5 or 10 euro a month.
Some more nextcloud providers:
1.) Hosting . De
- Nextcloud Hosting | Gratis mit 1GB starten | hosting.de
- Talk, Mail, ONLYOFFICE in paided versions
- activate and deactivate some more apps
2.) Pixel X
- Nextcloud Hosting - 5GB Cloud Speicher €0,00 | PixelX
- admin panel with app store
- no informationen for ONLYOFFICE and Collabora
3.) Webo . Hosting
- https://webo.hosting/nextcloud-admin
- full admin access, Talk, Document Server
4.) portknox . net
- https://portknox.net/en
- own instance
- database backup in nextcloud