While I've been enjoying Lemmy for quite some time now, my girlfriend is (was) a pretty active Reddit user and had always been hesitant to switch, mainly because she's active on many niche communities and couldn't decide on an instance.
Was because I just got her to sign up on Lemmy! We picked an instance for her together and she ended up on sh.itjust.works. We then created a list of subreddits that currently don't exist as communities on Lemmy in order of importance to her that she can create over time.
Felt good to be able to share something you like, can recommend ;) Also, giving your loved ones a hands-on introduction (in contrast to just "like e-mail...", cause where is the fun in that?) and picking a server together seems to help as well.