It's true that some people really do have to be on Facebook/Xwitter for work, but in that case I've always suggested that they also make a Mastodon/Lemmy/Pixelfed account and let people know about it ("why not join me on ...") and try to use the two (or more) side by side. Hopefully that will make the people they interact with realize that there are in fact good alternatives, and perhaps get them to join as well, further increasing the size of the Fediverse🌈.