PitchBook is a comprehensive database of private companies and angel/VC/PE investors. College students at some universities, such as University of New Hampshire, have free access to PitchBook which normally costs $40K per seat. If you pay these students a low hourly rate ($15-$20/hour), they can obtain an investor list for your space for likely less than $100.

These days, ChatGPT is a good tool to find competitors so long as you are descriptive about what such a competitor does as their core business. I find that if ChatGPT gives me a list and they are all real competitors, there are likely more, so I simply ask ChatGPT to produce more until those competitors I find are not so relevant. Another, more tedious way is to pretend to be a customer searching for such a service, whether you are on Google, social media, etc.