Keep moving forward.
Keep pressing on.
It is a struggle, but you can do it!
You must finish what you started. Don't quit because you are tired. Quit because you are finished. God quit creating the world on the seventh day -when he was finished. He could have quit on the first day, the second day, the third day, etc., but He had more work to do. Therefore, God waited until the world was complete (finished, done, finalized), and then He rested.
Ecclesiastes 9:11 reminds us that,
"The race is not given to the swift,
nor the battle to the strong..."