What if your best marketing tool is just showing up consistently when people least expect it?
I've found that staying top-of-mind without spending money comes down to genuinely useful touchpoints! I started doing these little seasonal check-ins with past clients - nothing salesy, just "hey, saw something relevant to your industry, thought of you" or "we're running a workshop in Q4 if you know anyone who'd benefit." People remember that you're thinking about them, not just when you need their money.
The other thing that's been a game-changer is making it stupid easy for clients to refer you. Not asking for referrals constantly, but literally saying "if you know three people who could use this, here's my link" or offering something tiny in return (even just a coffee). Most folks won't do it unprompted, but when you make the ask specific and low-friction, they actually follow through! My referral rate jumped once I stopped being coy about it and just asked directly.