i went through a similar experience. as a young person i spent all my school and university holidays traveling, only staying a few days in each place. there was no other option really, because i didn't want to outstay my welcome. as i started working i found jobs in remote places and instead of traveling went there to live and work which allowed me to spend more time with the same people and form deeper connections. still fleeting in a way, but less so. when i got married i effectively settled in china where i was able to make much deeper connections. in the meantime thanks to the internet (and in part thanks to covid motivating local groups to have online meetings) i was able to reconnect to old and new friends back home and keep in touch with them as well.