The best non-aggressive way is to post quality content here, then post a link to the lemmy page in a subreddit. Content is king they say, and where it’s hosted owns the content.

Or to put it another way: post the content here and post links to here on other social media. Stop treating Reddit as a first-class citizen, it’s just another channel where posting links will pull people here. Eventually folk will switch to the discussions here instead of commenting there. Play the long game.