Your first client almost never comes from a job board. It comes from one of three places: someone who already knows you, someone who watched you be useful in public, or a person you contacted directly about a problem you could see they had. Do all three at once for four weeks and one of them lands.
That is the honest shape of it. Below is what each one actually involves, ranked by how fast it tends to work.
Tell the people who already know you
This is the highest-yield thing you can do and the one people skip, because it feels like admitting something.
Former colleagues, your old boss, people you studied with, the friend whose startup you have been hearing about for a year. Not a mass email. Individual messages, specific, with a clear ask:
I have gone freelance, doing mostly React Native work. If you hear of anyone who needs an app built or fixed, I would appreciate you passing my name on. Happy to have a quick call with anyone who is unsure whether their thing is even worth building.
Two things make that work. It says what you do specifically enough to be remembered, and it asks for a referral rather than a job, which is a much smaller thing to say yes to.
Most first clients arrive through a chain of two people. You cannot see the chain from where you are standing, which is exactly why you have to start it.
Be visible where the problem gets discussed
Not "build an audience". That takes a year and you need work this month. The version that works quickly is narrower: go where people describe the problem you solve, and be useful in public.
Communities for the tool or the industry, not for developers. If you build Shopify apps, be in the places store owners complain about their stores, not the places developers discuss Shopify. Your clients are not in the developer room.
What being useful means: answer the question fully, for free, with no pitch. Someone describes a broken checkout, you explain what is probably wrong and how they would check. You are not fishing. Some of the time the person solves it themselves and nothing happens. Some of the time they message you.
Contact people directly, properly
Cold outreach works when it is not cold. The difference is whether you have looked.
Bad: "Hi, I am a freelance developer available for projects, here is my portfolio."
Better:
I use your booking page most weeks. On mobile the date picker cuts off the last row so you cannot select the 30th or 31st, which I would guess is costing you bookings at month end. It is a small fix. I am a freelance developer and would be glad to do it, but either way it is worth someone looking at.
That gets answered because it costs you effort and gives them something before it asks for anything. Ten of those beats a hundred templates, and the honest sign-off matters: mean it when you say they should fix it regardless.
What to do about having no portfolio
Ship something small of your own and finish it properly. Three finished projects, each live at a permanent address a stranger can open, is a complete portfolio.
The bar is not "impressive". It is whether someone can open it and use it without you explaining, whether it handles being used wrong, and whether it still works next month. What to put in a portfolio when you have no clients covers this properly.
What does not work: offering to work for free. It teaches the client your time is free, it usually produces something you are not allowed to show, and it attracts the exact people who will not pay later either.
Price the first one properly
The temptation is to go very low to win it. Resist it slightly.
You can be at the lower end of your range for a first client, and you should be clear that it is a starting price rather than your rate. What you must not do is take work at a number you resent, because it will show, and the reference you get will be lukewarm.
Work out your floor before you quote anything. The rate calculator gets you a defensible number from your target income and honest billable hours, which is a much better basis than guessing at what sounds acceptable.
Then get the second one from the first
The cheapest client acquisition available is the person who already paid you.
Finish well. Hand over cleanly: repo, accounts, credentials, a short walkthrough. Be easy to reach for the two weeks after. Then, a month later, ask directly whether they know anyone else who needs something similar.
Almost nobody asks, which is why it works.
What to expect
The first one takes longer than you think and arrives from a direction you did not plan for. The second is much faster. By the third you stop counting, because the referral chain has started and the problem changes from finding work to choosing it.
Four weeks of all three channels at once is a reasonable expectation. One week of half-hearted effort on any single one is not.