zurücktreten
to resign
To voluntarily give up an office, position, or function.
Der Minister ist nach dem Skandal von seinem Amt zurückgetreten.
The minister resigned from his office after the scandal.

to resign / step back
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to resign
To voluntarily give up an office, position, or function.
Der Minister ist nach dem Skandal von seinem Amt zurückgetreten.
The minister resigned from his office after the scandal.

'Zurücktreten' (to resign/step back) is a separable verb. The prefix 'zurück-' stands at the end in a main clause. In subordinate clauses or in the infinitive with 'zu', the verb is not separated.
Der Politiker tritt von seinem Amt zurück.
The politician is resigning from his office.
Since 'treten' (to step) expresses movement, the perfect tense of 'zurücktreten' (to resign/step back) is always formed with the auxiliary verb 'sein' (to be).
Der Präsident ist gestern überraschend zurückgetreten.
The president unexpectedly resigned yesterday.
When someone gives up an office, 'zurücktreten' (to resign) is often used with the preposition 'von' (+ dative) or 'als' (+ nominative). The context is usually political or professional.
Sie ist als Schatzmeisterin des Vereins zurückgetreten.
She resigned as treasurer of the association.
To express that one is canceling an agreement, the fixed expression 'von etwas zurücktreten' (to withdraw from something) is used. The noun after it is always in the dative.
Man kann innerhalb von 14 Tagen vom Online-Kauf zurücktreten.
You can withdraw from an online purchase within 14 days.
to pick up / keep / cancel
'aufheben' and 'zurücktreten von' can both have to do with something agreed or valid no longer applying. The difference lies in who is acting and what it is about. 'aufheben' is used more for rules, decisions, or provisions that are officially made invalid. 'von etwas zurücktreten' is used when a person cancels or withdraws from a commitment, contract, or agreement. Learners may confuse the words because both express an end. Memory aid: an authority 'hebt eine Regel auf' (cancels a rule), while a person 'tritt von einem Vertrag zurück' (withdraws from a contract).

Nach dem Gespräch tritt der Kunde vom Vertrag zurück.
After the conversation, the customer withdraws from the contract.
Die Behörde hebt die Entscheidung auf, nachdem neue Informationen vorliegen.
The authority cancels the decision after new information becomes available.