@JohnPhilpin I prefer to do this the other way around, but often forget to.
Ideally I'll post on Micro Blog, that goes to Mastodon and from there is relayed to Twitter.
If I post something new on my Ghost site (https:billbennett.co.nz) it gets relayed on Micro Blog and hopefully ripples out to the others.
There's a catch. The service that posts from Mastodon to Twitter can only cope with 300 messages an hour - that's a Twitter restriction. So not everything travels to the end of the line and in some cases things get there eventually, but wait for a spare slot, which can be hours.