You don’t need your ISP to assign a static prefix just to have static addresses on your home network. Instead choose your own prefix inside the fd00::/8 block. There is a procedure using hashing that you can follow to help guarantee that your prefix is unlikely to be shared with anyone else, but you don’t actually need to use it. Configure your router to advertise that prefix in addition to any prefix assigned by your ISP and all of your computers will give themselves an address in both prefixes. If you set your servers to base their address on their mac address, then every one of your servers will have a single unique address. Your client machines can keep their privacy–aware addresses that change frequently.

https://en.wikipedia.org/wiki/Unique_local_address

For my network I wanted something I had some chance of remembering so I consulted a dictionary and ended up with fdbe:aded:cafe:babe::/64.