Most founders chase the same growth levers: paid ads, cold outreach, social media. The tactics that actually punch above their weight rarely get airtime at conferences. Here are three underrated growth hacks for startups I have tested and seen work.

Most founders chase the same growth levers: paid ads, cold outreach, social media. These work, but they are crowded, expensive, and slow to build momentum. The tactics that punch above their weight in founder led teams are rarely the ones getting airtime at conferences.
Here are three genuinely underrated ones I have tested and seen work.
This tactic tackles two fundamental growth levers: churn and acquisition. Finding out proactively how happy customers are lets you catch the unhappy ones early, before they churn and damage your reputation. For the happy ones, asking for a review and rewarding a referral at that moment lays the foundation of a growth flywheel. Three connected steps, all runnable inside your CRM with little manual follow up.
Measure happiness first. An automated CSAT or NPS survey triggered after onboarding, a support resolution, or a usage milestone shows who is happy, before you ask for anything public.
Ask for a review at the right moment. Prompt happy customers automatically, while they are most likely to say yes. A handful of reviews lifts purchase intent, meaning shorter sales cycles and easier trust with new leads. Being happy is not always enough to prompt action, so a small reward lowers the barrier, and a personal call or message from an account manager tends to beat a fully automated prompt.
Introduce the referral ask while they are still glowing. Trigger a referral offer with a genuine incentive right after the review request. Referred customers convert at a higher rate than any other channel, and tend to be stickier, since they arrived already trusting whoever vouched for you.
Built once, the whole sequence costs next to nothing per customer and keeps paying off the longer it runs, funding its own growth rather than depending on paid channels.
Growth does not always mean producing more content. A lot of untapped traffic and conversion sits inside what you have already published.
Timeless topics do not need rewriting, but they do need to look current. Update any title carrying a published year, and add long tail keywords that match current search behaviour.
Repurposing goes further. Break a long piece into standalone sections, each becoming its own post, email, or landing page. Or work in reverse: pull several smaller pieces into one pillar piece, with the originals as supporting subpages. Combining the strongest sections into a single lead magnet is another option, using material your audience has already responded well to.
It is one of the highest leverage moves a lean content team can make, touching SEO, answer engine visibility, PR, and brand for little extra effort.
Directory submissions have a reputation for being outdated. In practice, they remain one of the fastest ways to generate early traffic and awareness for a launch or campaign.
One client recently ran a giveaway on a lean marketing budget and needed traction fast, before word of mouth kicked in. We submitted it to a competition aggregator built for people who browse giveaways, putting the offer in front of an audience primed to engage, giving it early momentum before organic sharing took over.
The same principle applies beyond giveaways. Think of it less as an SEO play and more as putting yourself where your audience is browsing, without having to go find them first. The backlink is a bonus, not the main event.
Make it work by matching the platform to your audience, spreading submissions over several weeks rather than fifty in a day, and having a working demo ready so anyone who clicks through converts faster.
None of these three are flashy, and none will fill a conference keynote. Yet seven and eight figure businesses often fall short here, not from ignorance, but because they underrate these tactics. All three share one quality: none are set and forget, but none cost the earth either, making them well suited to founders after cost effective growth.
If you want help working out which of these would move the needle fastest for your business, that is exactly the kind of prioritisation I help founders work through.
Main image by Growtika on Unsplash

Nina Jung is a Sydney-based growth strategist who works with founders as a fractional CMO and CRO, bringing senior-level strategy and hands-on execution at a fraction of the cost of a full-time hire. She also mentors early-stage founders and business students through GrowthMentor, Startmate, and UNSW.