Subliminals can work, but only when you're listening to paid products which promise something. YouTube subliminals are a scam ,especially this one. You can't use your unconscious mind to stop hair growth, this is ridiculous.
But you can be more productive or energetic if its affirmed many a times.
All the things that you want to do can be done by Simple self hypnosis while going to sleep and workings. Subliminals are extremely weaker as compared to that. Go to Academic Scholars posts, she has a thread compiling all workings in one.