Enough of this blah-blah. I will tell you what you wanted to know. There is a way to make it and keep the budget low. There really is, and there always was, a solution for those who don’t want to pay a fortune for promotion.
Your magical wand is called storytelling. You need to hire a creative marketer and/or storyteller. One/two person(s) working full-time on your lore, universe, characters, main plot, side stories, etc., will help you accomplish so much that you will never again underestimate the incredible power of stories.