At this point I would use Mastodon and follow Twitter users on there through the bird makeup instance. It basically creates mirrors of Twitter accounts so you can see what they post (but you can't interact). It'll only add new posts while somebody's following them though, so you might not have past posts if nobody has followed them yet.

Another thing is some people are posting to both now or have switched entirely. You can see who you follow on Twitter is using Mastodon with this site https://fedifinder.glitch.me/