I think the way to even shit out is to have Deku have his multiple quirks and everyone else basically Get Plus Ultra forms of their quirk ( Basically Bankai) so that we can see what the singularity actually is. I would like the quirk singularity is just a state of which their quirk gets more powerful but more complex as a trade off, so not everyone would be able to handle it or be able to use it well.
Also Have it start becoming a thing in Deku's Generation going forward and having some older Characters learn this new thing from the younger kids to try and bring it out into themselves. Doing this makes future power scaling way more even for all our heroes.
Like Tsuyu can manifest more esoteric frog like traits that are surprisingly deadly ( Some can turn hair into spikes, cause a color flash to blind nightvision predators, enhance her poison to be more Potent)
Sato can dope himself with different substances to get different effects and make himself Bane (He really needs Bane suit and he would become a fan-favorite)
Kirishimi can get more and more Monstrous with His Unbreakable form Because I think we all thought it was weird how he looked when he went deeper in his power.
Bakugo really just needs to be able to make explosions from his feet also and I think he would be able to hang with damn near anybody because his body is already strong as shit because it built itself to take the aftershocks of his explosions.
Todoroki to be more complete unison of his fire and ice usages.
Iida is just the flash So he gets kinetic vision as a sub superpower
Momo is an interesting one because her Plus ultra could be damn near anything Maybe more effiecient Lipid to size of the object so she can make alot more at once and bigger things over all faster.