What are the correct supplications and deeds that must be followed to relieve distress and mitigate the severity of destiny, and is destiny an inescapable reality?

Allah's decree is absolute, and belief in it is one of the pillars of faith. What was meant to befall you could not have missed you, and what was meant to miss you could not have befallen you. To remove distress and affliction, begin by rectifying your relationship with Allah through seeking forgiveness and repenting from sins, for no calamity descends except due to a sin, and none is removed except through repentance. "Seek forgiveness from your Lord and then repent to Him; He will let you enjoy a good provision." Replace evil deeds with good ones, and adhere to piety towards Allah in secret and in public, for "whoever fears Allah - He will make for him a way out and will provide for him from where he does not expect." Steadfastness upon Allah's command makes the servant's affairs upright in this world and the Hereafter, and "those who say, 'Our Lord is Allah,' and then remain steadfast - there will be no fear concerning them, nor will they grieve." Maintain righteous deeds, both obligatory and supererogatory, for the best of deeds are those performed consistently, even if they are few.