I wrote a blog post about using job post data to predict startup fundraises: https://www.coolstartupjobs.com/blog/predicting-startup-fund.... You can predict a decent chunk (~25%) of fundraises with this approach!
That was originally for a job board, but job boards are very saturated. I've pivoted to a data newsletter for startup investors to identify companies that are fundraising before you read about them on techcrunch: https://startup-spotter.beehiiv.com/