If your only indie game marketing strategy is posting on social media, you're playing a losing game from the start. Being popular online can kickstart a game's popularity, but actually selling it is a different matter. Posting a few dozen SNAKE FARM keys into the Cohost void pre-launch helped a ton for day-one success and getting those first essential positive reviews, but the vast majority of sales came from sending the game to streamers, playing steam's algorithm game, etc. Social media is only a useful tool if you recognize its limitations and have other methods of driving success!
ALWAYS remember the difference between flashy marketing and effective marketing. A post going viral feels great; annoying fifty streamers into playing your game doesn't.