Since there isn't a good way to fully migrate Mastodon accounts right now, I'll stick with the @write_as@writing_exchange account on #writingexchange. And if you want, you can follow our new account about development (@writeas_dev).
I never really liked publishing to the Writing.Exchange timeline with this account since it's a commercial entity (even if it's just me behind it). So I like this setup better -- an instance just for the product updates and such I'd otherwise be sharing on birdsite.
Will migrate the old @write_as@writing.exchange account over here soon.