How do i grow my small saas? Feedback needed.

Launched my first SaaS yesterday, an AI tool that generates BPMN diagrams, aimed at business analysts.

Posted about it on LinkedIn and got around 100 visitors and 20 signups on day one, so I’m pretty happy with that conversion rate but now I’m stuck on what to do next for growth.
Trying to figure out if it’s worth putting money into ads at this stage or if I should just keep grinding organic, and also how much I should be prioritizing SEO and backlinks right now since I’ve got basically zero backlinks yet.

Would love to hear from anyone who’s grown a niche B2B tool like this, especially if you’ve had luck reaching business analysts or BPMN and process people specifically.