i laugh when people say "what group can i join to do X"
its like asking what cabin can i trap myself in and circle jerk the same thoughts to others who think the same. whereby the outside world hears nothing.

but to answer the OP's question. he can suck eggs with core devs if he really wants to circle jerk the narrow mindset.

P.S if you really idolise decentralisation avoid joining core, avoid grouping yourself together in a small part of the internet, avoid trying to control the narrative with propaganda campaigns and instead spend your time actually learning what things are