How do you promote waitlist landing pages when you launch a new product?

I'm building a new product for DevOps and software engineers. I prepared a fancy landing page to explain what it does and what users can get.

Meanwhile, exposing the landing page itself is really difficult. I cannot post self-promotion postings on Reddit, my Twitter account doesn't have enough followers, DMs are treated as spam. I feel frustration these days.

I know I need to do things that don't scale as an entrepreneur. But I don't know how I can do that when I cannot post the landing page on forums where our target audience is in.