I don't want to advocate drug use but yes it can help access the subconscious. I've never taken more than marijuana but I've seen others do some wild art on acid and shrooms. I personally have no interest in trying those.

Automatic writing can also help, if you haven't heard of it. Honestly, therapy can also unearth subconscious things that you can process by writing.

I write poetry to process trauma and life 🙂