That's true, you have limited options when it comes to Reddit submissions no matter how crafty you are.
But comment promotion is unlimited, and for that reason, that's where my mind went.
For example, some of my highest volume referrals from Reddit were comment-replies I left on some submission that became the main result for, say, "best <product> 2020". People trust comments and they have weirdly-good authority in the SERPs.
Right now if you google "battery life of <product>", it parses a comment I made on Reddit in 2018 and shows in the instant-answer box.
I know I'm getting off the thread's rails. Just thought it was somewhat interesting.