Mobile phones have been one of the greatest drivers of functional enhancements for computing interfaces. I use the clipboard history feature on Android multiple times per day. Rather than copy one item, then paste it, then switch back, then copy another, then switch back etc - I just copy two items, switch app, and paste them where I want.
For some reason, I never considered doing that on Linux - until now!
Clipboard Indicator is a handy little Gnome extension. It sits on your dock monitoring your clipboard. Click the icon and get a list of what you've copied.
They're keyboard and mouse selectable, and you can set some to be permanently remembered.
There's a brief settings screen, but I found the defaults were suitable.
Having things like passwords in your clipboard history could be a security risk. I recommend using BitWarden as a browser extension to auto-fill passwords without using the clipboard.
Similarly, someone with access to your machine could look through your history.
The code is open source if you want to audit it.