keep (on) trying

Persist in your attempts to do something; don't give up. Keep on trying—you'll figure it out eventually. That almost sounds like a recognizable song now. Come on, keep trying!

To continue putting forth effort to succeed at some task, activity, endeavor, etc. Often used as a phrase of encouragement. I kept trying, but I just couldn't get the formula to work the right way. I know you're disheartened, but keep trying! You'll never succeed if you give up now!

Fig. a phrase encouraging continued efforts. Jane: I think I'm doing better in calculus. John: Keep trying! You can get an A. Sue: I really want that promotion, but I keep getting turned down. Bill: Don't quit trying! You'll get it.