Forgiveness of Allah

Allah is the Most Forgiving, Most Merciful. No matter what we have done in the past, He can forgive us if we do sincere taubah. But the forgiveness of Allah comes with some conditions. Allah says in the Qur’an:

Say: "O My slaves who have transgressed against their own selves (by committing evil deeds and sins)! Despair not of the Mercy of Allah, verily Allah forgives all sins. Truly, He is Oft-Forgiving, Most Merciful. And turn in repentance and in obedience with true Faith to your Lord and submit to Him, before the azaab (torment/disaster) comes upon you, then you will not be helped.”

[Surah az-Zumar 39:53-54]

Commentary:

Indeed Allah is ar-Rahman, ar-Raheem, but in order to get His mercy & forgiveness you must do the following:

(a) Leave the sin you are already involved in.
(b) Sincerely intend never to do it again.
(c) Turn to Allah and submit to His Will from now onwards, not your own desires.

This is the true way to please Allah and not be punished with an azaab in both dunya & akhira.

Here's a video to elaborate further in-sha'Allah: