Build your karma
Sometimes I see indie hacker posts about how Reddit is a harsh place, how their posts get taken down, and how they get banned. The reason for this is that they treat Reddit as a garbage bin. They bring their selfless marketing (garbage) to Reddit (the bin) and expects people to be in love with it. Let's say there is a community in your town you were never interested in it before. But now that you have a product to sell, you go to sell it. So you suddenly show up and do a sell pitch on your first meeting. You will be kick-out as a home to home seller.
Now consider a guy that goes to these meetups for years. If he's suddenly working on something interesting, he can always tell the others casually about it. People know he's genuine. He's meeting people for their shared interests, shares his knowledge, and cheers others up. This men treats the community like the shared responsibility. He makes it an interesting place to be and follows the rules.
This is why Reddit has post and comment karma. Reddit is a submission site on the outside but a community on the inside. So you need to be real. Find your actual interest on Reddit and start being an actual user. I am on Reddit every day, not kidding. I genuinely go there to read stuff and interact with others. I recently bought a Golf so I joined the Volkswagen subreddit. For fun. That's how you can quickly build up your karma and follow the self-promotion restrictions.
Failing on Reddit with your first post means you never tried to understand what it even is in the first place. It's not a garbage bin.