i did all three begginners courses and tips and tricks but i still have an extremely late vibrato at the end of my notes only, mostly til when im running out of breath and then it never sounds good... pls help 

Hi, Kay!

I recommend you look into our "Foundations of Vibrato" tutorial: https://www.30daysinger.com/tutorial/foundations-of-vibrato/1. 

Relaxation is (in my experience) the most important thing! Other technical "requirements" are good breath support, cord compression, and resonant space (which are covered in the above tutorial). But none of that will lead to a healthy, free vibrato if you're tense (in your throat or abdomen). 

Imitate the vibrato of singers you love; that can also help you learn to "let go" and create vibrato. It takes times, but I do think it comes quicker if you focus on mimicking singers with vibrato than just focusing on the technical side. 

If you feel vibrato come naturally, notice how it feels and sounds! See if you can go from vibrato to straight tone and back again, to learn what it feels like to "release" your vibrato.