Can you create your own Portals? Yes
The Six Portals are a selection of core experiences that seem to be common to many humans. But there is no limit to the number of such experiencess that exist. You can discover or create new ones all the time. They should be thought-feeling constructions that continuously fill you with new insights, sentiments, and connections.
One touchstone for inspiration is the list of Rare Emotions catalogued by Harvard professor Tim Lomas. They are feeling states that may exist in many places, but tend to be localized to one culture. (See drtimlomas/lexicography) Some examples are:
Lè jí sheng bēi (樂極生悲). Chinese / phrase / lɘːʤiːʃɛŋ.beɪ / ler-jee-sheng-bay. Lit. joy’s zenith generates sadness; intense joy begets sorrow; after a peak of happiness, unhappiness inevitably follows.
Wohlweh. German / n. / voːl.veː / vool-vey. Lit. well-pain; pain that is pleasurable (e.g., massaging aching muscles).
Xibipíío. Pirahã / n. / ɪ.piːˈbɪəʊ / ih-bih-pee-oh. Experiencing liminality; a phenomenon on the boundaries of perception or experience; going in and out of existence or range. It's a bit surprising that this word is in the list because there are only 800 people in the world belonging to the Piraha tribe in the Amazon, and they don’t even have words for numbers over 2. Is it possible their right brains are much more developed than the left?
Qarrtsiluni. Inuktitut / v. / kʌːrʒ.sɪ.luːnɪ / kartz-sih-loo-nih. Sitting together in the darkness, perhaps expectantly (e.g., waiting for something to happen or to ‘burst forth’); the strange quiet before a momentous event
Saudade. Portuguese / n. / sɐwˈðaðɨ / sow-dhadh. Melancholic longing, nostalgia, dreaming wistfulness
Kintsugi (金継ぎ). Japanese / n. / kɪn.tsʊ.gi / kin-tsu-gi. Lit. 'golden joinery'; the art of repairing broken pottery using gold; metaphorically meaning to render our flaws and fault-lines beautiful and strong