@sphenoid I've read many testimonies from people who've grown taller in their 20s and 30s by several inches or more using LoA (law of attraction/assumption), typically achieving their desired height within a few months. Repeating an affirmation like "I'm so tall", "I'm becoming [insert desired height]", or "I can feel my body lengthening" etc throughout the day, subliminals and audio recordings, and visualizing your environment from a taller height, all are very effective techniques.
I haven't done much to try and manifest height yet, but about a month ago I went into a height visualization for about an hour while laying on the couch, just repeating affirmations and imagining my environment from a taller perspective on loop, and when I stood up -- I shit you not -- I was painfully sore in my knees and hips. I was walking funny for a couple days afterwards.
It makes sense to me that LoA would be the most reliable way to grow taller because your body has to release a cocktail of hormones you simply cannot replicate with food and supplements alone. Your subconscious controls your brain which controls your hormones, and you impress your subconscious with your repeated thoughts and imagination; but persistence is key.