For EU-based, end-to-end encrypted cloud storage, here are the strongest options beyond what you’re already using:
Tresorit (Switzerland) : Probably the gold standard for E2EE. Zero-knowledge, Swiss/EU data residency, excellent for both file sync and secure sharing. More expensive than competitors but very polished and audited.
Filen (Germany) : Zero-knowledge E2EE by default, generous free tier (10GB), very competitive pricing on paid plans, and lifetime plans available. Open-source clients. Popular on the privacy subreddits as a Proton Drive alternative.
Internxt (Spain) : Open-source, zero-knowledge E2EE, GDPR-based. Offers storage plus a few extra privacy tools. Lifetime plans available. Younger company, so weigh that against the price.
pCloud (Switzerland, registered in EU) : Massive caveat: E2EE is not default. It’s a paid add-on called “pCloud Crypto.” Without it your files are encrypted at rest but not zero-knowledge. The draw is genuine lifetime plans, which can be cost-effective over years if you trust their longevity.