Motorcycle Clutch not engaging after gear shift? How to self-repair?

I have a 2013 Kawasaki Ninja 300. It only has around 2500 miles on it. I have ridden it fine with no problems before, but I have also not performed any maintenance on it aside from replacing a tire. While riding today I was trying to shift down to first gear and all of a sudden my clutch stopped working. I squeezed

I have a 2013 Kawasaki Ninja 300. It only has around 2500 miles on it. I have ridden it fine with no problems before, but I have also not performed any maintenance on it aside from replacing a tire. While riding today I was trying to shift down to first gear and all of a sudden my clutch stopped working. I squeezed it tight all the way but the clutch still wouldnt engage. I managed to get it home but have no idea whats wrong or how to fix it. I also have very little understanding of the mechanics behind a motorcycle. Any help or guidance would be appreciated. Thanks!

Other answer:

Jackson H:
You knocked the dogs off the gear shifting into first maybe. I won't ask how you ruined a tire in less than a quarter of the mileage it should have taken.
Steven:
No maintenance = no oil. Check it.
Tim:
You are very bad at driving stick you blew your clutch out in 2500 miles… I didn't even do that on the bike I learned to ride on
Audrey:
No maintenance = no oil. Check it.
Tim:
No maintenance = no oil. Check it.
WRG:
With "very little understanding of the mechanics" you risk doing more damage than is already there. At the very least your will need a shop manual.
Marshall:
No maintenance = no oil. Check it.
Jane:
No maintenance = no oil. Check it.
Evan:
No maintenance = no oil. Check it.
Exoplanet:
No maintenance = no oil. Check it.