Congrats on the lucid... Spinning is not a good technique to make the dream stable, it can ruin it easily...

When you are feeling your dream fading, try to grab something, whatever you can, it does not really matter and rub it within your hands, that will anchor you to the dream, as you will be holding an object, plant, whatever from the dream plane and will be stimulating your senses while rubbing it... you can prolong a dream a lot with this technique.