

A lot of classical music most people are exposed to are single movements within a larger composition. Listening to whole symphonies/concertos/suites/etc gives you a consistent vibe for 20-45 mins.
Some I like:
Violin Concerto in E Minor Op 64 - Felix Mendelssohn
Violin Concerto #5 in A Major, K219- Mozart
Symphony #2 in D Major - Jean Sibelius
Cello Suite #1 in G Major - J.S. Bach
Moonlight Sonata - Beethoven
Miserei Mei Deus - Gregorio Allegri (has an interesting story)


Agree with many of the other commenters on the multiple causes of loneliness.
I’ve been fortunate to find community at my Unitarian Universalist church. UUs don’t have an expectation to believe any particular scripture, but instead share a common set of values, the first being every one has inherent worth and dignity. My congregation has people who identify as atheist, Christian, Buddhist, Jewish, Muslim, and several types of pagan. So the focus is on being in community and helping each other grow and achieve their goals. I’ve made good friends through the choir and a young adult group that organizes social activities. UU congregations vary based on their membership, and many stream services virtually so you can check them out before going in person. Here’s a link to find a congregation near you.