Earlier quoted context omitted.
mostly from within the communities that you wish to follow... for instance the podcasts and youtube channels surrounding $HOBBY might lead you their own server. then once you're in a couple, and get chatting, people mention other servers, or one of the channels will be dedicated to listing similar or related servers. many will be linked/pinned from subreddits too. what's your interest? I might be able to point you to…
Thanks for the guidance. Most of my interests revolves around business, masterminds, entrepreneurship, freelancing etc.
Try Disboard.org - I found a few decent ones on there, and slowly networked my way into a few private ones. Some occasionally pop up in HN comments also. I left a lot of servers recently so I'm afraid I don't have any to offer you for those topics specifically.