> There are no "levers".
Everyone wants to believe that their community doesn't have levers. But this is just wishful thinking, ego talking. Of course HN has levers, of course the community here can be manipulated.
The easiest way I can see would be to frame a helpful, curious question to which your service just happens to be the answer. So then you most an Ask HN like "can anyone help me to understand why people do X" followed by a few sentences of your thoughts, then at the end say "I've been working on a service to help with this but we don't seem to be getting much to traction, here's a link".
Another approach would be "nerd sniping". Post your site but don't mention anything about what it's for and instead say "I'm having a problem with SSR rendering with NextJS on my site" or something like that. You'll get massive engagement.