I've lucid dreamed a few times and every time I was only able to be lucid briefly before I woke up. The last time I was lucid dreaming, I couldnt wake up which was scary. It wasnt sleep paralysis, the dream was I was in a very beautiful cabin during the day and my mom was cooking something in the kitchen. There were 2 of my cats which is how I knew it was a dream. In the dream I even told my mom. My this is a dream, but I cant wake up. And she said "Its ok just relax."

I want to get back into it but I also heard how astral projection is also connected to Lucid dreaming, My question is, I've constantly heard to unlock the full potential of lucid dreaming is not to do it to silly things. (having sex with someone you have a crush on or just flying around aimlessly). And to be wary of negative energy. What exactly should I be using lucid dreaming and astral projecting for?