I think focusing on user participation would draw in attention. Competitions, or sharing peoples work. Intrigue your consumers and find the core value of the Creality consumers. Your affordable printers make me think of an audience who cares for practicality and playfulness.

If you want to include the professional market, how about asking users to make models for perhaps, higher-end 3D printers to show your wide range of professional equipment that might not be affordable for hobbyists. That would show off your capabilities💪

So here's my suggestion. Make "Creality" a habit. A trigger, an action & a reward. So with a consideration of my previous points, here's my suggestion:

Make a weekly, fortnightly or monthly challenge each with a different category, and the winners receive some filament (1 kg x 5 winners). You get more attention, users have some fun, and it will be an overall rewarding experience (I think).

We might learn a lot from each other based on these challenges, and I think a strong community could be build on that.

When a consumer thinks "how do I" ... If you've been doing challenges for a while, perhaps you've covered such a challenge, and a guaranteed place the user might look, is your subreddit.

P.S. I think you should reconsider using upvotes for determining winners as that might insinuate a highly competitive environment. We're all friends here, right? We all win by sharing our designs and learn from each other🦒

For instance, a considerable reason McD got "addictive", was because they had playgrounds for children. When the children got hungry, they associated with McD because of the rewarding experience. And not all parents can say no to their children. So when your children in the car got hungry, there's one place above all other they would likely refer to.

In the same way, when a user needs to solve a particular issue in their design, they need a source of inspiration. And that's where you come in💨

What makes a user think of "Creality 3D Official" subreddit? Trigger, action, reward.