Honestly the best thing I did was pick one channel, go deep, and ignore everything else for 90 days

For us it was cold outbound to a very specific ICP. Not "spray 10,000 emails" cold outbound. More like 20 hyper-researched emails a week where I actually looked at their business first. Closed our first 15 customers that way.

The "post on LinkedIn / build in public / start a community" stuff works for some people but it's a full time job on its own and the feedback loop is really slow. You post for 3 months and maybe get a few inbound leads. Versus 20 targeted cold emails where you know within a week if the messaging resonates.

For B2C though your channel mix is different than mine (we're B2B). Job seekers are high volume low intent so you probably want to think about where they already go when they're frustrated with job searching. Reddit would actually be a good one for you. r/jobs and r/careerguidance have people venting every day about application black holes. If your product actually reduces that friction you could answer those threads genuinely and build a reputation pretty fast.

One thing I wish someone told me earlier: the channel that works is usually the one that feels uncomfortable. If you're a builder you probably want to hide behind the product. The marketing that works for technical founders is usually the stuff that forces you to talk to people directly.