How would you go about finding a recruiter sans LinkedIn? :)
_Using_ LI, costs attention too, increasingly so, as with all social networks, but you also receive some in exchange, so if you don't value your own attention all that much higher than every other human's on the planet ¯\_(ツ)_/¯
...yeah, it's pride.
How much money have you made by creating a profile on HN and reading and posting to it and giving it your attention since 2015?
At which point you're pretty much always going to be asked for a LinkedIn, and pretty much noone will want to put work in for someone not doing something has simple as creating an account. So, unfortunately, as the other comment said, swallow your pride.
These networks have made it so that the cost of idealism is being cut off socially, whether that's friends or employers.