You need to find a way to consistently reach out to your target market and talk to them about their problems. You can cold call or cold email. I don't like cold calling, but for cold email I use quickmail.io.

I also use LinkedIn to reach out to people, since you can directly target B2B customers/business owners. I use https://linkedprospect.com/ to consistently reach out to people using LinkedIn

Start with your users.

Talk to your most loyal users and try to identify their needs and the value they are getting from your SaaS. Why do they use your service? What is their single biggest frustration / the single biggest value they get from your service? Can you find similar customers? How can you reach more of the users you want?

Once you really nail the value proposition you have and map out clearly who your customers are and why they love your service it is easier to know where you're going for marketing and growing your business.

Add multiple payment methods.

We added web money, cryptocurrencies, wire transfer.

And it has increased our conversion rate by 10%, we are in B2B market internationally.

Look into: http://killbill.io/ for SaaS subscription management. It's free and opensource.

Background: I’ve been working with B2B SaaS companies for over 9 years now, helping mostly with product design.

Observation: One thing most companies seem to mean by ‘growing’ is getting more traffic. The big advantage of B2B software is that you can do very very well with very very small amounts of potential users flowing through your funnel.

Solution: The biggest thing I’ve seen contribute to B2B product growth is by far a focus on increasing conversion rate (instead of traffic generation). UX design plays a central part of this (Full disclosure, I run http://fairpixels.pro - a design firm for software products in this space, so I might be biased, but the data I see every day backs this claim up). Stating the obvious, but it’s a lot better to have 50 people visiting your website every day, and get 5 of those to subscribe to your annual plan, vs driving 200 people to your website but only having 2 or 3 join.

Map out your user flow. Where does your lead come from? When on your website, what does he/she see & do? What’s the one CTA you present them? Is your value prop clear? Does your CTA have the right color and is the placement right? Does the look & feel of your website communicate professionalism, trustworthiness, etc.

It’s sexy to think about driving thousands of users to your platform, but it’s more practical, useful and valuable to focus on those questions.