What are quick ways to improve your singing abilities?

Keep listening to music!!! If you have a great interest in singing and in music itself, you won't need any quick ways...when you sing, remember to pay attention to the smallest details...to that particular note, that little pause, it matters...And, the basic steady ways of improving one's singing is by singing, and singing constantly and joyfully. Music has a hidden beauty in it...it is used to serenade hearts, it is used to express love, joy, sorrow, anything you feel...so in singing, just feel what you're singing, and remember to sing constantly....

There is no "quick way". Your best bet is to learn how to breathe. Yes, there's an art to it, and it's amazingly athletic!

its all about the vocal warm ups. hum the lowest notes you can sing and the highest. it gives your voice more resonance and clarity.

I've heard that taking a shot of olive oil helps before a huge performance....

From what I saw in my sister-in-law who is an opera singer, she drinks herbal tea, no cold water whatsoever, eating properly and having good night sleep. Set aside time for voice lessons but don't overdo.