How Can Muslims Avoid Hellfire?

Qur'an, Surah Maryam, 71 (T. Usmani translation from quran.com)
There is none among you who does not have to arrive at it. This is undertaken by your Lord as an absolute decree, bound to be enforced.

Quran, Surah Az-Zukhruf 74, 75
The sinners will be in the Punishment of Hell, to dwell therein eternally: Nowise will the (Punishment) be lightened for them, and in despair will they be there overwhelmed. ==> this means that all Muslims will be eternally condemned to hell because none of you are without sin.

They can ask for forgiveness for their sins with all their might, but Allah not certainly will forgive them.
QS At Tahrim (66):8
O believers! Turn to Allah in sincere repentance, so your Lord 𝗠𝗔𝗬 absolve you of your sins and admit you into Gardens, under which rivers flow, on the Day Allah will not disgrace the Prophet or the believers with him. Their light will shine ahead of them and on their right. They will say, “Our Lord! Perfect our light for us, and forgive us. ˹For˺ You are truly Most Capable of everything.”