I recently signed up for a mastodon account (@mikededmon@mastodon.online) and wanted a way to sync posts between my Mastodon account and my twitter account.
After some searching and digging, I found a service that will do just that for you. https://moa.party/ will sync cross-post between mastodon and twitter. It only took me a few minutes to setup and works like a charm.
Once you’ve entered your mastodon id and then authorized your twitter account, you’ll have options for both services. They are self-explanatory and I just stuck with the defaults. Check it out, it works like a charm for me.