Getting downvoted usually isn't bad luck. It's a pattern. The same comment that gets buried in one thread would sit near the top in another, with a few small changes. Here is what sinks a comment, and the order that keeps it afloat.
Why comments actually get buried
Reddit is fast and allergic to anything that smells like marketing. Four things sink most comments:
The order that keeps a comment up
Write the comment in this sequence and most downvotes never happen:
People upvote answers. They downvote pitches. Most comments fail because they're the second thing wearing the clothes of the first.
Read the room before you type
Before commenting in a sub you don't know, read the top three comments on any post. You'll pick up the tone, how long replies usually are, and whether links are normal there or a fast way to get removed. Two minutes of reading saves you a buried comment.
The part most advice skips
You can write the perfect comment and still get nothing, because you found the thread too late or it was never a fit for what you do. Picking the right thread early is harder than writing the reply, and it's the part that quietly decides the result.
That's the job we built Karmy for: it watches Reddit and pings you the fresh, on-topic threads worth answering, with a draft you can make your own.