I built a bookkeeping tool for freelancers—here’s how it’s going so far "I will not promote"

I launched Nobooks, a bookkeeping service that works via text messages. Instead of apps or spreadsheets, it just pings you when something needs to be categorized and automatically handles 1099 & W9 filings. We’ve got paying customers, but I’m still figuring out growth. If you’ve scaled a niche SaaS before, what worked best for you? Cold outreach? Paid ads? Partnerships? Also happy to share any lessons learned on launching a bootstrapped SaaS.