EzekielRaiden
Follower of the Way
Humans absolutely do not need more things to make people play them. They have always been the most popular option, period. Every edition, every non-D&D system I'm aware of that offers such a choice, (nearly) every video game for which we have statistics. Humans are far and away the most common option. If you count part-human options like tiefling, half-elf, etc. as humans too, then humans are legit an actual majority of characters in D&D.Fortunately for me, perhaps, dragon breath*, celestial wings, and half-feats aren't things I need to worry about.
But the numbers IMO greatly inform what the species is all about and how it presents. For example, that a typical Elf is more dextrous and less strong than a typical Human tells me a rather great amount about Elves.
* - except from the opposition side, every now and then.
Significantly - it says "here's a species that doesn't do magic well". This, if course, is the downside that pays for the upside of their ideally being way better warriors than most others.
One can even take it a step further and say that magic items have a small chance of not functioning if used-held-worn by a Dwarf.
Wasn't intending to specifically pick on Dwarves; other than Humans I'd like pretty much every species to have a few banned classes in order to perhaps make Humans a bit more appealing to play.
There is no need to make them "more appealing." They already are appealing, immensely so. They would be appealing if they outright sucked, which they do not. (Well, standard human isn't great in 5e, it's passable but not very strong, but variant human is very powerful, and the listed human in One D&D is closer to the latter.)
The irony of course is that some popular options actually did suck in the PHB. Like dragonborn, which got a massive rework specifically because they were always a bit below par compared to nearly everything else in the PHB--and yet their popularity did nothing but grow over the three years we got clear stats from D&D Beyond (2017, 2018, 2019.)