Always the community wanted to have a roadmap that helps them in the professional development area within the scope of Xamarin.
I have always recommended what Xamarin University is, which is quite possibly already migrated in Microsoft Learn for those who are in the future.
What I have done is to take as a base the roadmap proposed by Xamarin University to create a new one. So, If you want to see the original base I really recommend you to go there before they migrate it to Microsoft Learn.
It is good to mention that the changes to the original roadmap are completely based on my criteria, and on the help of some collaborators, on what is believed to be able to help the whole community.
Get started here.