Yeah this technique is the same thing as MILD (Mnemonic Induced Lucid Dream), although here are some helpful tips that apply that you may not have tried:

Stare at the spot between your eyebrows or somewhere near there that is comfortable. It helps.

Repeat your intent OVER AND OVER in your mind. "I am dreaming. This is a dream. The next scene will be a dream" etc.

This is the only meathod that consistently works for me, but it never seems like it is going to work. It seems like I have been trying forever, and then BAM, I'm in. Lucid as can be.