There is Nextcloud which is not only eu-based but open source as well. You choose what parts you run but it competes with most of workspace and office 365 (everything but the arguably obscure stuff*). I use all three (g-workspace, office 365 and nextcloud) and I strongly prefer nextcloud excluding my private preference of open source - even more so from an administrative perspective (fuck the workspace admin pages, they causes me so much trouble)
*except email-server which although easy to add on trough stalwart or external email provider is technically not part of the nextcloud ecosystem (webmail is however)
Cloudflare I don't know if there are good competitors by my own experience, but some are listed here: https://european-alternatives.eu/alternative-to/cloudflare
*except email-server which although easy to add on trough stalwart or external email provider is technically not part of the nextcloud ecosystem (webmail is however)