Reddit is the default and some of us have gotten used to lurking, since it was always big enough that someone else did the voting and top comments. I look at fediverse as an opportunity for change, and in return asking I become an active community member again. Post the latest you see, comment, explain, etc . At least up vote is the content is good.
As long as you are the mod of your /m/, you can make it clear that direct copy of Reddit is acceptable for your /m/. You're reposting the link in fediverse, with the intention to initiate conservation here because of better moderation. That sounds fine to me. Even the mod can lead by cross posting from Reddit. Yes, It's the content. Yes, Reddit is the biggest content source (for now). Don't shy away from leveraging it.
Consider who we are and who you want to be. The assumption that power users, tech savvy folks moved over to fediverse more openly. I think that is true. Think if you want to start being the "first" of the Internet. That's how digg was, that's how Reddit grew, even 4chan made a name being the place for the hottest trash takes and going viral once in a while. So post here, and then cross post into Reddit. If they want to be the adult company a layer higher, then so be it.