I made it to try and learn d3 and typescript in general. I posted it as a "Show HN" but it got no clicks so I sort of just let it sit there. To be honest, when I saw how good most online drawing tools were, and how basic and amateur level my tool was I got demotivated and decided to leave it as is.
A few things;
1. There's no good onpage stuff to tell google that this is an appropriate word for it.
2. Based on page speed probably wouldn't rank well compared to others
3. As you noted, links.
This is a good point. I have been wondering how does one do SEO for such online tools? If you only have the tool present, it will be definition not have much text content which Google uses to gain context for the site.
Write blog posts about it, every angle you can think of. Development, marketing, building a side project, whatever...
Makes me wonder how many other cool projects out there never get discovered because they can’t get by the search engine gate?