The "Myth" books started as a humor series, and (as I'm considering a Bog Standard Fantasy novel) I'm remembering them as an example of very minimal world building, and most of it centered on the Bazaar at Deva. The strength of the books was the characters and dialogue.*
Compare and contrast to, say, Harry Potter or Wheel of Time, both series with very in-depth world building that inspires a lot of love in fans. "You can imagine you are there!" But (for my money, anyway) that's about all they have. I bailed on HP after "Goblet of Fire." I read one-half of one WoT book and greatly prefer the RPG sourcebook. The settings are well-drawn and intriguing, but I don't care about the characters and so wander away.
The gold standard, of course, is to do it all well. But Perfectionist Lass needs to NOT try to accomplish that, lest she get bogged down in getting it all "right" in preference to actually doing anything. I don't want to get hung up on not having a world to set a novel in.
My authorial strengths, if I have any accurate gauge of my own abilities, are in dialogue and characterization. I love dialogue so much that, if I'm not careful, I end up writing something that looks more like a script and less like a story. I should figure out what story I want to tell and then drop an appropriate setting around it, I think.
*Modulo nostalgia factor. At ten (and even fifteen), I thought puns, pop culture references and breaking the fourth wall were hysterical.