I don't think this works. The communities which are successful here on Lemmy are the ones where a large group of people left Reddit at once. For example the piracy people or the german meme community and a few other examples.
I've seen several communities in which one or individuals post daily, but it somehow doesn't really lead to more engagement. It stays more or less the newsfeed of that person. It is better than a dead community and a few people read it and maybe upvote, but I've never seen this approach generate traction and change things around in a substancial way.
At least that's my observation. Feel free to send me counterexamples if I'm wrong... I'm also interested in how to foster healthy and nice communities... But at this point I have no solution to offer.