Although my initial opening (awakening) was deeply transdual, I realize now that I made the mistake of attaching to a feeling - an object - as "it". And this may be why it all eventually and apparently fell apart.
Now, I find especially sounds helpful in finding the crystal clear formless awareness, that which is changeless, always here, effortless, and has a diamond quality to it. I often enjoy doing sitting practice with music for that reason, such as (tonight) Kila's Lemonade & Buns (!) with its energetic quality. The rest of the time - in daily life - any sounds will do as a reminder.