If you have a look at some of the most popular YA books out there at the moment you'll see ones like Cassandra Clare's Shadowhunters world books, which vary from about 150k-250k words long, Sarah J Maas's Throne of Glass books, which started at about 120k and keep getting longer and longer. Even Rick Riordan's Percy Jackson books, which are intended for a Middle Grade audience (but definitely appeal to adults) are about 100k words long. The Hunger Games, which is arguably the most popular teen book of the last decade is roughly 105k words.
I suppose the point I'm trying to make is, unless you're happy to market your book as a novella (and there's nothing wrong with that) you really need to bulk it up a LOT. Focus less on plot and more on characters. Make sure you've explored the relationships fully and that each character has been given the chance to grow throughout the book.
As I'm aware though, YA books top out at like 80k for first time authors. Now, once a debut novel does really then you can really do whatever. The rules are just different for an unknown author compared to one with a proven track record.