When bootstrapping something, marketing is about finding distribution channels that work for you. Looks like you never found such distribution channels, learn and keep grinding on that, organic and tik tok dancing is not the only game in town. I do everything from tech to sales, marketing and support for my company based of my oss work: Filestash (https://github.com/mickael-kerjean/filestash). For my business, the most important channel is SEO and particularly creating online tools to get people to interact with the product so if you search for "online ftp client", "online s3 browser" you will inevitably found my product. That's the top of the funnel, the cold traffic and the goal is then to transform that onto paid customers. For me, I make calls with users, try to understand their problem and fix it for them. In practice it's a lot tougher than it looks because with AI less and less people are / will pay for software