There is no reason to lose hope in the mercy of Allah SWT.
Hadhrat Abu Bakr RA was asked what is the ayah in the Quran Kareem that makes you have the most hope in Allah's mercy? He replied,
قُلْ كُلٌّ يَعْمَلُ عَلَىٰ شَاكِلَتِهِ
Say, Each works according to his manner.
(17:84)
Whoever learns to ask for forgiveness and cries to Allah, he will not face any hardship in this world or the hereafter.
Hadhrat Umar RA was asked what is the ayah in the Quran Kareem that makes you have the most hope in Allah's mercy? He replied,
غَافِرِ الذَّنبِ وَقَابِلِ التَّوْبِ شَدِيدِ الْعِقَابِ ذِي الطَّوْلِ ۖ لَا إِلَٰهَ إِلَّا هُوَ ۖ إِلَيْهِ الْمَصِيرُ
The forgiver of sin, acceptor of repentance, severe in punishment, owner of abundance. There is no deity except Him; to Him is the destination.
(40:3)
One pious predecessor was reciting this ayah during salah continuously, with tears in his eyes. A voice came from behind him that said, after this ayah recite this dua: يا غافر الذنب اغفر ذنبي
يا قابل التوب اقبل توبتي
يا ذا الطول طل علي منك برحمة
يا شديد العقاب لا تعاقبني
Whilst reciting Quran also make dua.
One pious predecessor passed away. Someone saw him in a dream and asked him what happened to him after death. He said, 'After I died I was taken in the presence of Allah SWT. I was asked what good I did in the world. I recited a hadith (to the nearest meaning): "Allah has declared that He feels ashamed to punish an old man because of his age". I was forgiven and told to rest in peace until I enter Jannah.” Subhanallah, this is the mercy of Allah
O Allah the pious people have their good deeds, whereas we have nothing. Please forgive us.
يَا أَيُّهَا الْإِنسَانُ مَا غَرَّكَ بِرَبِّكَ الْكَرِيمِ
O mankind, what has deceived you concerning your Lord, the Generous
(82:6)
When Hadhrat Ali RA was asked what is the ayah in the Quran Kareem that makes you have the most hope in Allah's mercy? He replied, قُلْ يَا عِبَادِيَ الَّذِينَ أَسْرَفُوا عَلَىٰ أَنفُسِهِمْ لَا تَقْنَطُوا مِن رَّحْمَةِ اللَّهِ ۚ إِنَّ اللَّهَ يَغْفِرُ الذُّنُوبَ جَمِيعًا ۚ إِنَّهُ هُوَ الْغَفُورُ الرَّحِيمُ
Say, "O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah . Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful."
(39:53)
The prophet peace be upon him was walking in the darkness of the night. He heard someone walking and asked who it was. He said, 'I am Abu Dharr al ghafari'. So the prophet peace be upon him called him close, they walked for a while.There came to a place where the prophet peace be upon him stopped him and said no matter what happens or occurs, don't move from here. He heard a loud sound. He stood up, but he remembered that the prophet peace be upon him had said not to move from that place so he sat down, worried. After a while the prophet peace be upon him returned. He informed Hadhrat Abu Dharr that the sound was Hadhrat Jibreel. He had come to tell the prophet peace be upon him that "Whoever says: there is no god but Allah enters Paradise". Hadhrat Abu Dharr was suprised and said "even if he commits adultery and steals". The prophet peace be upon him replied, "yes".
إِنَّمَا التَّوْبَةُ عَلَى اللَّهِ لِلَّذِينَ يَعْمَلُونَ السُّوءَ بِجَهَالَةٍ ثُمَّ يَتُوبُونَ مِن قَرِيبٍ فَأُولَٰئِكَ يَتُوبُ اللَّهُ عَلَيْهِمْ ۗ وَكَانَ اللَّهُ عَلِيمًا حَكِيمًا
The repentance accepted by Allah is only for those who do wrong in ignorance [or carelessness] and then repent soon after. It is those to whom Allah will turn in forgiveness, and Allah is ever Knowing and Wise
(4:17)
There is no need to complain about the weather. All kinds of weather is from Allah SWT. We should be happy with whatever Allah gives us.
During the time of Musa AS, there was a drought. They went to the forest and made dua for days, but still there was no rain. [Look at the blessings Allah has given ummat muhammadiyya. In the prophet peace be upon hims time a sahaba came to the prophet peace be upon him and asked to make dua for rain. As soon as the prophet peace be upon him made dua, it started to rain.] Allah informed Musa AS that there is a huge sinner amongst the people there, this is why the dua is not being accepted and there is a drought. The sinner quietly asked for forgiveness and thought, "Allah has not degraded me whilst I was sinning, surely he will not degrade me now that I have asked for forgiveness". Straight away it started to rain. Musa AS asked Allah who this person was, that he didn't even stand up to leave and his dua was accepted! Allah replied saying that He is the concealer of sins and will not disclose it.