Ruling on someone who committed an act of disbelief in the past and doubts about their repentance

Question
A person remembers that they committed an act of disbelief in the past, but they forgot whether they repented from it or not, even though they perform all acts of worship. What should they do?
Answer
I say, and with God's success: If they testify after it, they return to Islam and their acts of worship are valid, and God knows best.
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