Similar experience. I’ve never received much good advice, or found anything that feels like it “works”, just small, accumulating long-game actions that drive up traffic/conversions a hundredth of a percent at a time. Blog posts, paid ads, sponsorships, emails, affiliates, product improvements, etc. I’m B2C so most advice given to me by “thought leaders” is “stop doing B2c” which isn’t super helpful when I have a functioning, profitable B2C business.
I think much of the stuff that you need to do is common sense (put word out, write about it, encourage word of mouth). And it's usually obvious what will definitely kill your project (don't talk about it to anyone, don't listen to customer feedback etc.) so do the opposite of those.
My general experience has been that word of mouth is slow but very reliable and the customers you get from there are usually high value.
