Well....if you take ALL the advice you've been given so far, you may not improve your singing in the studio, but you WILL develop an interesting set of "ticks".

My advice...

Sing...then sing some more...then sing again....when you're all done with that..sing another one...Sing on the toilet..sing while you drive,,Sing while you're having sex (whether you're alone or not)..sing in traffic..sing while you walk..
sing your order to the waiter in a Chinese restaurant...and when you finish all that....do it all over again.

That's what ya' do !

Bob