I've been using free Dropbox for a long time. After hitting my storage limits about year ago, I started learning about alternatives for the paid plans. Ended up with self hosted Nextcloud ( https://nextcloud.com/ ), which is open source. Been super happy with Nextcloud, would definitely recommend it for anyone who isn't fully happy with Dropbox.

The clients for macOS and iOS are not as polished as Dropbox and many apps use Dropbox integrations, but I've managed to find workarounds for everything except 1Password, which is why I'm currently looking for alternative (preferrably open source) solutions for it.

For me the self hosting is not a problem and there are several hosted options available as well. (For example: https://www.hetzner.com/storage/nextcloud )