Yeah, I see @oshsigurdson in the the list, that's good. He is one I would recommend for 3Speak.
Someone else who could be good is @clixmoney, who was recently deplatoformed from Twiiter and demonetised on YouTube because he promotes Steem, Steemit and Dtube. YT especially is very picky about promoting platforms that are not it, and Twitter keeps changing its rules, it's difficult to keep up.