Are you battling with a challenge that may lead you to disbelieve, don't give up on your Iman. You may get the worst of challenges when you disbelieve.
Life challenges doesn't end, although you may overcome a lot and achieve a lot. But, you may never stop overcoming challenges till death. Hence, you have to uphold your Iman and remain resolute to your Deen, even during the worst of challenges.
Life challenges are a way to prepare you for the future. As a Muslim, it helps you to live a better life in this world and the hereafter when you stay true to Allah (SWT).
No matter what the problem may be, don't give up. Instead, heighten your Ibadah. You're closer to victory.
Many a times, you get the worst of temptation when you're about to overcome a problem. So pray for Allah's guidance and stay true to him.
The best way to overcome any challenge is to believe in God, pray, fast, and give to the less privileged. Your situation will surely get better if you remain patient and prayerful.

Ma sallam

One of the ways to avoid disbelieve is to pray for Allah to guide and protect you, and increase you in Iman, even during the worst of challenges. Pray tahajjud regularly and complete your obligatory prayers as required of you.