What did you do that was key in your experience?
I myself have tried various things that are essential, but all works as part of a puzzle.
Stream-of-consciousness about these (sorry a bit off topic):
1) Detach yourself from "culture" and try to meditate, do breathwork, some people get into this zone better while doing stuff like Tai Chi, Yoga or Chi Gong. Go slower!
2) Exercise but find something that your body responds well to and don't over do it (many people exercise mindlessly)
3) Be social, you are a mammal and need to be touched and feel other peoples breath, warmth and voice close to you - it's a part of tribal nature, and balances your sympathetic nervous system
4) Get out in the sun and stroll around without purpose sometimes just walking, thinking, exploring the city/forest - again we are wanderers in our genetic heretage (you often think better when walking without purpose - french people call it Flâneur)
5) Create more than you consume: write, work, plan, set goals. Without a plan you are walking aimlessly and will run out of resources, feel left out and wither.
6) Eat and drink well. (fast sometimes, less junk food, more vegetables, enough protein for activity level, more organ meats if meats at all)
7) Be brutally honest towards yourself, but acknowledge that self image is malleable and mysterious like the rest of the universe. So always have an echo of awe in the back of your mind. This reality is amazingly absurdly weird, wonderful, mysterious, dreamlike, filled with obscure esoteric symbols of knowledge and history and tradition and truth in an all encompassing and infinite web all around you and your consciousness.
8) Read challenging fiction, do math, play and instrument. (or some one of these, it has to be difficult)
Understand this key is a chain where all parts are equally important like:
Learn to imagine so you can make a plan or have a vision. Imagination is a precursor to planning, and meditation and unplugging is a precursor to to this imagination. If your mind is clouded the first plan is to eat well, rest, and slowly introduce exercise until your mind is in a state of clarity, and you can actually feel "something" in your gut (ie intuition or your second brain), then you feel what you "want" in you gut, and create your plan with your non-clouded mind.