People will lose hope on Allah because if they start to recall their bad deeds toward people, they will realize that there is no possibility to even fix them. Allah (سُبْحَانَهُ وَ تَعَالَى) says
Say, ˹O Prophet, that Allah says,˺ “O My servants who have exceeded the limits against their souls! Do not lose hope in Allah’s mercy, for Allah certainly forgives all sins.1 He is indeed the All-Forgiving, Most Merciful.
Here I see nothing but hope, that even when the person can not fix the sin he did about the people, he still ask Allah for forgiveness and repent and Allah will still forgive Him by His Kindness.
I remember many years ago how low I felt when I readed 40 greater sins book (It is very good and important) and how low I felt and almost lost hope, but because of the Qur'an and Ahlulbayt narrations and duas, I saw nothing but the Most Loving God.