I personally generally recommend Mint as a good starting distro. It is widely used, which means lots of support readily found online. It also has some of the benefits of Ubuntu without having the Snap forced on users. It also generally works well on a wide range of systems including lower powered systems due to its selection of desktops.
Your laptop is decent and I’d personally be running a slick desktop on that, specifically KDE. But alot of that comes down to personal preferences, and Mint isn’t the best KDE desktop as it’s not a main desktop for it (although it is available).
However once you get to grips with the basics of Linux I think other distros offer better more focused benefits for different user groups. There are lots of choices such as Gaming focused distros, rolling release vs point release distros, slow long term projects like Debian vs bleeding edge focused projects, immutable systems etc.
I personally use OpenSuSE Tumbleweed because it’s cutting edge, but well tested prior to updates, with a good set of system tools in YaST, and decently ready for gaming and desktop use. I also like that it is European. But that may not be a good fit for your specific use case. Leap, the OpenSuSE point release distro would be better - a nice KDE desktop with a reliable release schedule and a focus on stability over cutting edge.
All of these can be run on any Linux distro. Dropbox is probably a better choice than Google Drive as Google drive doesn’t have an official Linux app (but you can get it working beyond just using it in a Web browser if its a must).
I’d go.with Linux Mint as it’s well supported but any point release distro will serve your needs well. For example Fedora KDD or OpenSuSE Leap, Debian etc. I wouldn’t recommend Ubuntu.