I have an interest to respond to this post.
Astral projection or rather conscious astral projection(c.a.p)requires constant practice and faith, as with every art. Nothing falls on laps just out from blues.without working for it in conformity with the laws of motion.
So try harder and remain focused telling no one (especially those without this knowledge).You need to choose one technique. Try with a choice you made and keep on practicing privately every night.
However if you continue for may be one year without success then it is the time you look for another technique.
Remember you must be seriously meditating/centering yourself.
You can get great help from :
www.the awakening consciouu.com.en/
I wish you bright blessings.