High elves don't breed fast enough to dominate. Dark elves have the chronic backstabbing disorder on top of everything else. Wood elves are basically the hillbillies of the elven folk and are content staying in their forests.
Dwarves don't breed fast enough either, also they wouldn't give enough of a shit to dominate the surface world. They'd be content underground.
Lizard folk are dependent on the climate for the most part along with the limiting mating cycles. Unless this is some prehistoric era conditions, they aren't dominating shit.
Orcs and goblins fight among themselves too much and are for the most part too disorganized to dominate unless you've got some evil overlord leading them around like Sauron and in that scenario, orcs/goblins aren't really "in charge."
Kobolds, its sort of the same thing as the orcs and goblins. Though in their case, you'd have Smaug leading them around instead. And if you've got dragons leading kobolds, then it's more like dragons dominating the world and kobolds are just the loyal lackies.
But for the sake of picking something, let's have dwarves and kobolds fighting some sort of eternal underground war for domination of the planet, using surface dwellers as pawns in all of this.
Kobolds would have number advantage and tame creatures like wyverns, lesser dragons and make pacts with the smarter ones. Probably ally with lizard folk when possible.
Meanwhile dwarves engage in their usual tech advantage, make iron and stone golems, steam tanks, etc. Sell the lesser stuff to humans who are always willing to go kill some fast breeding nuisances like kobolds or slay giant flying reptiles. (And get themselves killed in the process as well which keeps their numbers down too)
Going to ultimately go with the dwarves though since I know we like decisive picks around here.