Do a search on the forum for Unbound Training as there are a lot of threads with some great advice in them…also search for Unbound by year (Unbound 2024, for example) for additional insight and advice about the event itself.
Example:
If you put Unbound into Plan Builder, and feed it the number of hours you have available to train, you should get a solid training plan, but will likely need to augment the longer endurance rides over what is typically suggested by Plan Builder. You will see this topic come up quite a bit when you search the Unbound training threads.
There is also a current Unbound 2025 thread that you can jump into, as well…