Lost password note iPhone

[Kantvdh]

Impossible to reminder the password I put on a note on my iPhone 12promax. I don t know why but my FaceID doesn t work anymore on that note. 
I saw few posts on the same subject but it is too complicated for me..

I really need help to get it back. 
I m a real novice. 😝 

Is there easy tuto that a can follow to get it back ? 
Thx in advance 

Kant