"On the back burner" would be my guess.
Student or Learner
What about 'a watched pot never boils'?
I'd go for "Put it on the back burner" too. It means to postpone something, usually to leave it alone for a while and then go back to thinking about (or doing something about it) later.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
The pot calling the kettle yellow.