Just a general question Canon wise : the powers that Sidious attains in Rise of skywalker ie absorbing all the souls/powers of every Sith etc can any Sith do that or only him ie his blood line only? Say for example could someone like: Dooku, Savage, Darth Maul, Assaj etc attain that much power like Sidious did at peak if they tried hard enough etc ?
And just generally as well: the power level that Siduous has in general can any Sith become that powerful as him if they tried etc ?
Plagueis discovered essence transfer, and taught Palpatine how to do so. They are the only characters in canon who knew that ability.
As for Palpatine becoming the 'god vessel' for all the Sith in history: it wasn't explained how he pulled that one off. However, it is certainly not something your run of the mill Sith could duplicate.
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."