Is the feeling of inadequacy and the fear that redressing injustices is insufficient after sincere repentance and rectifying all wrongs a justification for worrying about God's non-acceptance of repentance?

Indeed, Allah accepts the sincere repentance of the one who repents, no matter how great their sins, for He says: "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.'" Among His names, exalted be He, are Al-Ghafur (the Forgiving) and Ar-Rahim (the Merciful), and He rejoices in the repentance of His servant. It is also from His mercy, exalted be He, that He transforms the evil deeds of those who repent to Him into good deeds, for He says: "Except for those who repent, believe, and do righteous deeds - for them Allah will change their evil deeds into good ones. And ever is Allah Forgiving and Merciful." The true Muslim combines fear and hope.