I ran into the same wall with my site a while back. Nothing I did seemed to move the needle. Then someone in an SEO group mentioned a link building agency called vladenza. I gave them a shot. Clean manual links, no spammy PBNs, and they sent me reports every month. Took a few months but my organic traffic finally started climbing and a couple of my main pages got into the top ten. Nothing exploded overnight, just steady progress. That was my experience.