You're doing all the right things, you just have to stick with it. One tip I can give you: right before going to bed, do some RCs and tell yourself that you will lucid dream, then forget everything and sleep. A lot of times people will have success seemingly "accidentally." They'll try really hard to get a LD, then when they stop putting effort into and forget about it, it clicks. So don't go to sleep willing yourself to have one.

Good luck!