Reading your other comments it does sound like you could use cash/credit to increase your google ad spend and onboarding more customers faster that would be a good use of funds. Could you hire another contract employee to speed up getting people on board?
If you can get signups from your adwords spend who sign up as paid in less than 30 days you could increase your spend in adwords on a credit card paying the balance each month to avoid interest charges. Stream line your on-boarding process to get customers on board.
Adwords can go from printing money to shredding money pretty quick so use caution of course. But I think funding extra adwords with a credit card would be a nice way to grow signups if you can speed up your onboarding process.
On bootstrapping . . .
Being able to set your own pace, call your own shots, don't give that up.
Inspiration: DHH Startup School Talk https://www.youtube.com/watch?v=0CDXJ6bMkMY
He also talks about limiting your work hours each week, give yourself blocks of time to work on your SaaS so you make the most of your time when it's available.
Feel free to email me if you want to bounce ideas around through email . . . HNusername at gmail.
I do have a part time support person I am paying with "profits" (I am profitable as long as I keep working for free). So yes this is 100% where I am putting my money for a while, not for development.