in a lucid dream, or a normal dream, ask your subconscious for more lucid dreams! Ask and then meditate with your eyes open. Ask and pray to God when awake to have a special dream like this, that you can get into a LD and ask your self for many more long and special lucid dreams.
It is hard to have the prospective memory to remember to do this when in a dream!
Let me know your ideas. Peace! <3