When talking about switching to Lemmy, the idea that gets communicated often sounds very abrupt. Despite Lemmy growing a lot, for at least a long time it will never reach the amount of content Reddit has, so a majority may feel discouraged to keep using Lemmy. But that doesn't have to happen. You can keep browsing Reddit to find those things you need and for those small communities that still haven't migrated, and in the meanwhile be part of Lemmy by creating posts and commenting on them, as long as you do it. One day, there will be enough activity here to let all of us use Reddit only for archival purposes.
Felt like it was important to say to make the switch less intimidating
Personally, I'm not finding Lemmy/Kbin to be difficult and I still plan to use both until old.reddit finally goes away. It's a transition, not a switch being thrown.