I would have trouble remembering an entire nsec myself.
For me if I chunk things into 3 character parts, that helps me remember longer numbers etc, seems to have a flow or cadencein my head that works. If you could do that with bigger chunks of 6 or so it may work. 

 Cheers  

 Consider a brain wallet

https://youtu.be/wHQrvCGVkTw?si=T_xs6TC3WtIQTakR 

 Ah you said nsec. I believe you can convert them to BIP-39 and still do this but with more complexity and steps. 

 Thanks man 

 Why not save it in a password manager like Keepass or Bitwarden?  

 That is certainly good practice, but memorising it means it's truly always available to you, even offline. 

 Without a computer rather