Affiliate marketing might work, depending on your SaaS. e.g. this is what drove convertkit to 600k MRR
> Once we hit about $20,000 MRR (through direct sales and word-of-mouth) we added an affiliate program. That worked exceptionally well because bloggers — our target market — are used to using affiliate programs to generate revenue. Also, if a small business owner loves your product they might tell 2-3 friends. But if a blogger loves your product, they'll tell 20,000 readers! So we had a very natural distribution path built in.
> We decided to pay a 30% recurring commission each month, rather than a large upfront commission, mainly because we didn't have any cash and couldn't cashflow anything up front. That turned out to be a great decision since many bloggers want a predictable, recurring income source.
> Later on we started doing webinars with our affiliate partners as a way to help them drive more sales. This not only grew our email list significantly (up to 50,000 subscribers in a year), but also drove a ton of new revenue. Today we pay out just over 10% of our revenue each month to our affiliates."