I self-published in 2010 and have forgotten the process.

Hello. I self-published a 50K-word business/marketing book in 2010 that was sold on Amazon, Barnes & Noble, and was available for ePub and MOBI.

As I review my old book folder, it seems I used Lightning Source for getting the book on Amazon, Bowker for ISBN, and a book design agency to do my cover, interior design, typesetting, and proofreading, (receipt attached).

Is this the same process in 2025?