One way to do it is to connect all your cloud accounts through a tool that lets you access them from a single interface. There are a few options out there, and it really depends on what you need—some focus on syncing files, while others just let you browse and manage storage more easily.
I’ve been using CloudMounter because it mounts cloud drives like regular folders on my computer, so I don’t have to open different apps or log in separately. It’s not the only solution out there, but it works well if you just need quick access without constantly switching between accounts. Worth checking out if managing multiple storages is getting annoying.