Bitcoin can be detected during withdraw, How can I withdraw my bitcoin in the safest manner without being detected?
Without being detected from/by whom? The blockchain? The Feds? Your parents?
The way to redeem bitcoin for fiat with the least amount of attention is via private transaction, you sell your bitcoin to someone for fiat, the deal is arranged offline, and you transact usinge a thumbdrice or "bearer bond" type mechanism, like OpenDime.
What are you tryng to protect yourself from?