>> I want to better control my anxiety and cultivate a more positive headspace.<<

I found a fascinating article about how more diversity of birdsongs leads to improved mood, so I wrote a post about it. Nature is uplifting in general, but for maximum impact, aim for a place near you where you can listen to the most possible birds. A park with a pond or river is a good bet.

>>Authentic, open-minded, introspective folks who write about what's going on in their lives and/or what's on their mind.<<

I post regularly about a wide range of things.

>> I like it when people comment semi-regularly, but I'd rather receive no comments than ones that feel forced or perfunctory; in turn, I'd like friend(s) who don't expect a comment on every post.<<

I check my friends page sporadically so it varies how much I comment.

>>Singing, travel, Geocaching, reading<<

Those sound cool. You might like common_nature, where people often post about their outdoor excursions.