As a digital comms and usability professional, I’d suggest you do some testing and refinement of these materials. I commend your efforts but these are not something I would ever hand out to a 50yr old volunteer if I want them to sign up to use a fedi community instead of

“When you want to send an email, you don’t need to use the same email provider as the person you’re sending it to.” is not a helpful thing for a newbie (though I understand why you have included it)… This sort of content indicates the gulf between the (user’s) mental model and the (system designer’s) conceptual design is too great.

I have students who can help you with this stuff for free. If you’re interested, DM me.