I don't know any creative person who hasn't considered quitting. It's hard to push forward when your dreams/goals haven't been met.
If you're thinking about quitting, pause and consider these few thoughts:
Everyone on the journey gets weary. Don't mistake needing a break for wanting to quit.
Instead of quitting, gather a tribe of encouragers. For me, that's folks in the writing community as well as close friends and family. Be honest and let them know you're struggling. A little encouragement can go a long way. That encouragement can give you a fresh boost of confidence.
Set aside one project for another. If you're writing, start a new project. After you get a grip on how that one is shaping up, put it aside and go back to your previous project. Fresh eyes can find new inspiration.
If you're frustrated about how far you've come (or not come), get serious with yourself. Sometimes setting a deadline or a schedule can get you headed toward creating a habit. Once, it's a habit, it's easier to continue.
Look at how far you've come and how much you've learned. If you quit now, you'll never know how much further you can go.
It's better to try and know for sure than to quit and never know.
Don't wait for the perfect time to keep going. Today's as good as any other day. Get cracking!
If you're going to quit anything, quit making excuses and quit waiting for the right time! For all you know, success is just around the corner. Press on! If you had a good reason to start, you have a good reason to persevere.
Of course, I wouldn't leave you without an encouraging verse from scripture:
Work willingly at whatever you do, as though you were working for the Lord rather than for people. Remember that the Lord will give you an inheritance as your reward, and that the Master you are serving is Christ. Colossians 3:23-24
Write on (or whatever endeavor you're doing), friends!