I encourage you to engage directly with the sacred texts and writings of the Bahá'í faith, including the Hidden Words and other foundational documents.
I appreciate your encouragement.
There are many texts about forgiveness. For example this prayer
O my God, O Forgiver of sins and Dispeller of afflictions!
O Thou Who art the Pardoner, the Merciful!
I raise my suppliant hands to Thee,
tearfully beseeching the court of Thy divine Essence to forgive,
through Thy grace and clemency,
Thy handmaiden who hath ascended unto the seat of truth.
Cause her, O Lord, to be overshadowed by the clouds of Thy bounty and favor,
immerse her in the ocean of Thy forgiveness and pardon,
and enable her to enter that sanctified abode, Thy heavenly Paradise.
Thou art, verily, the Mighty, the Compassionate, the Generous, the Merciful.
Or this one, revealed by Bahá'u'lláh
My God, Whom I worship and adore!
I bear witness unto Thy unity and Thy oneness,
and acknowledge Thy gifts, both in the past and in the present.
Thou art the All-Bountiful, the overflowing showers of Whose mercy
have rained down upon high and low alike,
and the splendors of Whose grace
have been shed over both the obedient and the rebellious.
O God of mercy, before Whose door
the quintessence of mercy hath bowed down,
and round the sanctuary of Whose Cause loving-kindness,
in its inmost spirit, hath circled,
we beseech Thee, entreating Thine ancient grace,
and seeking Thy present favor,
that Thou mayest have mercy upon all
who are the manifestations of the world of being,
and deny them not the outpourings of Thy grace in Thy days.
All are but poor and needy,
and Thou, verily, art the All-Possessing, the All-Subduing, the All-Powerful.