production is so poor sam and ben can't buy a new rug for their heads

Humans, elves, dwarves, and halflings of the classic ones—people know them and the archetypes, and for that reason I leave them alone for the most part and do not arbitrarily alter them ("uh in my world elves are sentient hybrid tree-deer people and actually they have super short lives and uhh").

For other races, I make up my own because they should be different enough to be distinct and worthy of inclusion. Upright beetle people, giant intelligent spiders famous for their web pattern-based spellcraft, etc.

If it's not either one of the tippy-top archetypes or something weird enough I wanted to include myself, it doesn't exist. Humans themselves have plenty of variety, and those cultures are more fully-fleshed than 50 arbitrary types of sub-elf or para-elemental bullshit or whatever.

Is this approach "the best" for worldbuilding or whatever? Probably not, but it works as a nice middle ground on the spectrum of "humans only," "classic fantasy" and "muh original setting donut steel." It also means I don't need to justify a bunch of bullshit races I can't keep track of and their places in the world, only the ones I see as interesting enough to have floating around in my head already.