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.
The games I pre-bought to play on Deck, these aren't the games I play on it. I figured it would be good with things like Days Gone, Citizen Sleeper, Disco Elysium, but instead I ended up playing mostly Euro Truck Simulator 2 in the early days. The driving is surprisingly good handheld, far superior than keys and mouse.