As others have already said, you’re not required to allow any race in your homebrew setting. Heck, half my settings only allow humans and that’s it (not DnD though).

That being said, if you go for high fantasy, I think elementals (aka genasi) always add quite a bit to the lore and I would add at least one scaly race. Be it Dragonborn, Lizardmen or Naga and maybe a beast race if it fits your world.

But it really depends on the kind of world you want.

Not what you’re asking, but relevant: I’ve mostly played in homebrew worlds and exclusively DMd homebrew, and what ive found is actually having the different races have some representation means more than their historical heritage in the world. If it comes up, maybe in prep detail it out a little. If there’s only one Tabaxi in the world, it’s origin is more suspicious (needs explanation) than if players encounter them occasionally.

Wanting my players to be open to trying less common races I recently made a d100 including every race I could find so that the NPCs can be anything instead of whatever pops in my head in a rush to describe the shopkeep.

I would just write the world in a way that is interesting to you, and add to it as players show interest. “Hey, I want to play a Tabaxi” -> “oh okay, let me think about what that means and I’ll get back to you.” This also gives you more latitude for using their ideas to inform the world. “I want to play a Tabaxi Wizard” -> “oh interesting, maybe there’s a clan of them that…”

You’ll be able to focus on what you care about, which will make the world more interesting, and allow players to incorporate things they care about if they wish, which will make it more fun for them too. Framing it in terms of “up for deletion” implies you need to answer everything about the world from the start, which is not only inefficient but an impossible standard. Just because you haven’t considered something doesn’t mean it can’t exist.

You are legally required to have dragonborn WITH TAILS. Sorry, I don’t make the rules.