Easy and fast cloud solution?

As much as I try to use open source solutions, Google Drive remains one of the best cloud solutions for me.
I say "easy and fast" because creating an account is fast, and has a lot of free storage (15 GB).

Is there an app as good as the Windows Google Drive app?
Or are there other cloud solutions I might have missed that are worth trying?

I'm specifically looking for a two way sync solution, not an "online only" option like KDE's KIO GDrive.

I came across Celeste, an open source app that seems awesome, but I noticed a bunch of negative reviews on its flatpak page.
https://github.com/hwittenborn/celeste
Has anyone used it?

Thanks in advance! Please mention me if you reply.