Honestly? Google Ads won't directly bump your organic rankings-anyone who says otherwise is selling something. But here's what I've seen work: strong brands rank well because they've already built authority, backlinks, user signals, and a mountain of indexed pages.
From what you've described, this isn't a content problem. it's a site-wide trust issue. 500 words, a handful of guest posts, and five pillar articles? That's not going to touch established competitors in a tough category. You're basically trying to out-armour a tank with a cardboard shield.
I've spent over a million on Facebook Ads this year, and I see the same dynamic there too. Ads alone don't build domain authority-they drive traffic, sure, but if your site doesn't have the topical depth and backlink profile to back it up, you'll spin your wheels. Focus on earning real editorial links, getting those product pages indexed properly, and building category-level topical clusters. that's where the leverage lives.