Welcome to Dreamviews, and congrats on your lucids! For me, the best way to stabilize is to touch something in the dream or focus on my dream senses. So touching the wall, the ground or rubbing my hands helps the most. In any case, with a little practice you will start having longer and more stable dreams so just keep practicing!

If you haven't already, I encourage you to make a dream journal on DV and post some of those lucids.