I love bootstrapped companies. I was in the exact same position about 6 years ago. My advice: it is time to put a grey hat on. I'd do the following:
1) Buy an email lists of property companies and send some unsolicited emails to people that want your product but don't know it . "Are you tired of dealing with rental application forms?"
2) Use fiverr to contact property owners on craigslist.
Once you get to about $10k/month you can stop doing these things and there will likely be natural organic growth. You can then start spending a few grand a month on "Free Rental Application", "Rental Application Template", etc. keywords. That will drive predictable growth over time with very little effort.
Alternatively, and maybe combined with #2, I'd suggest looking at LinkedIn for brokers and property management companies. Sounds like they're your big customers and individuals or small landlords will help but won't make or break your business. Therefore, it makes sense to specifically look for the potentially big customers and go hard after them.
1) Buy an email lists of property companies and send some unsolicited emails to people that want your product but don't know it . "Are you tired of dealing with rental application forms?"
2) Use fiverr to contact property owners on craigslist.
Once you get to about $10k/month you can stop doing these things and there will likely be natural organic growth. You can then start spending a few grand a month on "Free Rental Application", "Rental Application Template", etc. keywords. That will drive predictable growth over time with very little effort.