This strongly depends on what you're going to write and in what genre. For example, if you were going to write Fantasy Litrpg or Progression Fantasy you'd want

This strongly depends on what you're going to write and in what genre. For example, if you were going to write Fantasy Litrpg or Progression Fantasy you'd want to consider publising on royalroad.com (with eventual patreon) before moving completed books off royalroad and onto Kindle Unlimited. Advertising, in litrpg you'd post on reddit r/litrpg and r/progressionfantasy to let people know about the story.