What has worked for me (when I remember to stabilize) initially was looking at my hands in detail, every hair, crease and imperfection.

I have been working lately on using the environment more and more. Touching and just interacting with the environment. I have also tried verbal commands such as shouting "focus" in your dream.

One thing that really destabilizes my dreams and kicks me out quick is what others have said on here, thinking about dreaming, your dream body and what to do next. Thinking about waking life always makes me spiral out. Also over excitement tends to do it. It seems when I am constantly on the move without thinking about it too in depth are when I manage to remain lucid the longest.